Add support for existing dependent re-evaluation bogus postponements

1 files changed, 672 insertions, 402 deletions

diff --git a/tests/pkg-build.testscript b/tests/pkg-build.testscript
index 3b63c4e..8f41cad 100644
--- a/tests/pkg-build.testscript
+++ b/tests/pkg-build.testscript
@@ -5982,420 +5982,690 @@ test.options += --no-progress
           $pkg_drop tex baz
         }
 
-        : replace-re-evaluate
+        : replace-re-evaluation
         :
         {
-          $clone_cfg;
+          +$clone_cfg
 
-          #  Dependencies:
-          #
-          #  bax: depends: libfoo(c)
-          #       depends: {libbox libbar} (c)
-          #
-          #  baz: depends: {libbar libfoo} (c)
-          #
-          $* bax baz 2>!;
+          : initial-collection
+          :
+          {
+            $clone_cfg;
 
-          $* libbox/0.1.0 2>>~%EOE%;
-            %.*
-            trace: pkg_build: refine package collection/plan execution from scratch
-            %.*
-            trace: collect_build: add libbox/0.1.0
-            %.*
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of existing dependent bax/1.0.0
-            trace: postponed_configurations::add: create {bax^ | libbox->{bax/2,1}}
-            trace: collect_build_postponed (0): begin
-            trace: collect_build_postponed (1): begin {bax^ | libbox->{bax/2,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1}}
-            %.*
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: collect_build: add libfoo/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {bax^ 2,1: libbox libbar} to {bax^ | libbox->{bax/2,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
-            %.*
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libfoo
-            trace: collect_build_postponed (1): cannot re-evaluate dependent bax to dependency index 1 since it is already re-evaluated to greater index 2 in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}, throwing postpone_position
-            trace: pkg_build: collection failed due to earlier dependency position, retry from scratch
-            %.*
-            trace: pkg_build: refine package collection/plan execution from scratch
-            %.*
-            trace: collect_build: add libbox/0.1.0
-            %.*
-            trace: collect_build_prerequisites: overwrite dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
-            trace: collect_build: add libfoo/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0
-            trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_postponed (0): begin
-            trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
-            trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing retry_configuration
-            trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, adding shadow dependent and re-negotiating
-            trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
-            trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
-            trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves non-negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing merge_configuration
-            trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
-            trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
-            trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
-            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
-            trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: begin libbox/0.1.0
-            trace: collect_build_prerequisites: end libbox/0.1.0
-            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
-            trace: collect_build_prerequisites: end bax/1.0.0
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
-            trace: collect_build_prerequisites: resume baz/1.0.0
-            trace: collect_build_prerequisites: end baz/1.0.0
-            trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}!
-            trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_postponed (0): end
-            %.*
-            trace: execute_plan: simulate: yes
-            %.*
-            EOE
+            #  Dependencies:
+            #
+            #  bax: depends: libfoo(c)
+            #       depends: {libbox libbar} (c)
+            #
+            #  baz: depends: {libbar libfoo} (c)
+            #
+            $* bax baz 2>!;
 
-          $pkg_status -r >>EOO;
-            !libbox configured !0.1.0 available 1.0.0
-            !bax configured 1.0.0
-              libbar configured 1.0.0
+            $* libbox/0.1.0 2>>~%EOE%;
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              %.*
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of existing dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libbox->{bax/2,1}}
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {bax^ | libbox->{bax/2,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1}}
+              %.*
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: collect_build: add libfoo/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {bax^ 2,1: libbox libbar} to {bax^ | libbox->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              %.*
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libfoo
+              trace: collect_build_postponed (1): cannot re-evaluate dependent bax to dependency index 1 since it is already re-evaluated to greater index 2 in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}, throwing postpone_position
+              trace: pkg_build: collection failed due to earlier dependency position, retry from scratch
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              %.*
+              trace: collect_build_prerequisites: replace dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
+              trace: collect_build: add libfoo/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing retry_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, adding shadow dependent and re-negotiating
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves non-negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing merge_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
+              trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: begin libbox/0.1.0
+              trace: collect_build_prerequisites: end libbox/0.1.0
+              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
+              trace: collect_build_prerequisites: end bax/1.0.0
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
+              trace: collect_build_prerequisites: resume baz/1.0.0
+              trace: collect_build_prerequisites: end baz/1.0.0
+              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}!
+              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): end
+              %.*
+              trace: execute_plan: simulate: yes
+              %.*
+              EOE
+
+            $pkg_status -r >>EOO;
               !libbox configured !0.1.0 available 1.0.0
-              libfoo configured 1.0.0
-            !baz configured 1.0.0
-              libbar configured 1.0.0
-              libfoo configured 1.0.0
-            EOO
+              !bax configured 1.0.0
+                libbar configured 1.0.0
+                !libbox configured !0.1.0 available 1.0.0
+                libfoo configured 1.0.0
+              !baz configured 1.0.0
+                libbar configured 1.0.0
+                libfoo configured 1.0.0
+              EOO
 
-          $pkg_drop bax baz libbox
-        }
+            $pkg_drop bax baz libbox
+          }
 
-        : replace-re-evaluate2
-        :
-        {
-          $clone_cfg;
+          : collect-postponed
+          :
+          {
+            $clone_cfg;
 
-          #  Dependencies:
-          #
-          #  bax: depends: libfoo(c)
-          #       depends: {libbox libbar} (c)
-          #
-          #  baz: depends: {libbar libfoo} (c)
-          #
-          #  box: depends: libbox == 0.1.0 (c)
-          #
-          $* bax baz 2>!;
+            #  Dependencies:
+            #
+            #  bax: depends: libfoo(c)
+            #       depends: {libbox libbar} (c)
+            #
+            #  baz: depends: {libbar libfoo} (c)
+            #
+            #  box: depends: libbox == 0.1.0 (c)
+            #
+            $* bax baz 2>!;
 
-          $* box/0.1.0 2>>~%EOE%;
-            %.*
-            trace: pkg_build: refine package collection/plan execution from scratch
-            %.*
-            trace: collect_build: add box/0.1.0
-            trace: collect_build_prerequisites: begin box/0.1.0
-            %.*
-            trace: collect_build: add libbox/0.1.0
-            info: package box dependency on (libbox == 0.1.0) is forcing downgrade of libbox/1.0.0 to 0.1.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent box/0.1.0
-            trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
-            trace: collect_build_prerequisites: postpone box/0.1.0
-            trace: collect_build_postponed (0): begin
-            trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
-            %.*
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: collect_build: add libfoo/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {bax^ 2,1: libbox libbar} to {box | libbox->{box/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
-            %.*
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libfoo
-            trace: collect_build_postponed (1): cannot re-evaluate dependent bax to dependency index 1 since it is already re-evaluated to greater index 2 in {bax^ baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}, throwing postpone_position
-            trace: pkg_build: collection failed due to earlier dependency position, retry from scratch
-            %.*
-            trace: pkg_build: refine package collection/plan execution from scratch
-            %.*
-            trace: collect_build: add box/0.1.0
-            trace: collect_build_prerequisites: begin box/0.1.0
-            %.*
-            trace: collect_build: add libbox/0.1.0
-            info: package box dependency on (libbox == 0.1.0) is forcing downgrade of libbox/1.0.0 to 0.1.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent box/0.1.0
-            trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
-            trace: collect_build_prerequisites: postpone box/0.1.0
-            trace: collect_build_postponed (0): begin
-            trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
-            trace: collect_build_postponed (1): pos-postpone existing dependent bax re-evaluation to dependency index 2 due to recorded index 1, skipping {box | libbox->{box/1,1}}
-            trace: collect_build_postponed (0): overwrite dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
-            trace: collect_build: add libfoo/1.0.0
-            trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_postponed (0): postpone cfg-negotiation of {box | libbox->{box/1,1}}
-            trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}
-            trace: postponed_configurations::add: merge {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}} into {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
-            trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves negotiated configurations and results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?, throwing retry_configuration
-            trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, adding shadow dependent and re-negotiating
-            trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}
-            trace: postponed_configurations::add: merge {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}} into {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
-            trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?
-            trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves non-negotiated configurations and results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?, throwing merge_configuration
-            trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?
-            trace: collect_build_postponed (1): begin {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
-            %.*
-            trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
-            trace: collect_build: add bax/1.0.0
-            trace: collect_build_prerequisites: reeval bax/1.0.0
-            %.*
-            trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}} (shadow cluster-based)
-            trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
-            trace: collect_build_prerequisites: re-evaluated bax/1.0.0
-            trace: collect_build: add baz/1.0.0
-            trace: collect_build_prerequisites: reeval baz/1.0.0
-            %.*
-            trace: collect_build: add libbar/1.0.0
-            trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}} (shadow cluster-based)
-            trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}
-            trace: collect_build_prerequisites: re-evaluated baz/1.0.0
-            %.*
-            trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
-            trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
-            trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
-            trace: collect_build_prerequisites: begin libfoo/1.0.0
-            trace: collect_build_prerequisites: end libfoo/1.0.0
-            trace: collect_build_prerequisites: begin libbox/0.1.0
-            trace: collect_build_prerequisites: end libbox/0.1.0
-            trace: collect_build_prerequisites: begin libbar/1.0.0
-            trace: collect_build_prerequisites: end libbar/1.0.0
-            trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
-            trace: collect_build_prerequisites: resume bax/1.0.0
-            %.*
-            trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
-            trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
-            trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
-            trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1}}?
-            trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
-            trace: collect_build_prerequisites: dependency libbox/0.1.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
-            trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
-            trace: collect_build_prerequisites: end bax/1.0.0
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
-            trace: collect_build_prerequisites: resume baz/1.0.0
-            trace: collect_build_prerequisites: end baz/1.0.0
-            trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.1.0
-            trace: collect_build_prerequisites: resume box/0.1.0
-            trace: collect_build_prerequisites: end box/0.1.0
-            trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1}}!
-            trace: collect_build_postponed (1): end {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
-            trace: collect_build_postponed (0): end
-            %.*
-            trace: execute_plan: simulate: yes
-            %.*
-            EOE
+            $* box/0.1.0 2>>~%EOE%;
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add box/0.1.0
+              trace: collect_build_prerequisites: begin box/0.1.0
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              info: package box dependency on (libbox == 0.1.0) is forcing downgrade of libbox/1.0.0 to 0.1.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent box/0.1.0
+              trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
+              trace: collect_build_prerequisites: postpone box/0.1.0
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
+              %.*
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: collect_build: add libfoo/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {bax^ 2,1: libbox libbar} to {box | libbox->{box/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
+              %.*
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libfoo
+              trace: collect_build_postponed (1): cannot re-evaluate dependent bax to dependency index 1 since it is already re-evaluated to greater index 2 in {bax^ baz^ box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}, throwing postpone_position
+              trace: pkg_build: collection failed due to earlier dependency position, retry from scratch
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add box/0.1.0
+              trace: collect_build_prerequisites: begin box/0.1.0
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              info: package box dependency on (libbox == 0.1.0) is forcing downgrade of libbox/1.0.0 to 0.1.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent box/0.1.0
+              trace: postponed_configurations::add: create {box | libbox->{box/1,1}}
+              trace: collect_build_prerequisites: postpone box/0.1.0
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {box | libbox->{box/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {box | libbox->{box/1,1}}
+              trace: collect_build_postponed (1): pos-postpone existing dependent bax re-evaluation to dependency index 2 due to recorded index 1, skipping {box | libbox->{box/1,1}}
+              trace: collect_build_postponed (0): replace dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
+              trace: collect_build: add libfoo/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): postpone cfg-negotiation of {box | libbox->{box/1,1}}
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}
+              trace: postponed_configurations::add: merge {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}} into {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves negotiated configurations and results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?, throwing retry_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, adding shadow dependent and re-negotiating
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {box | libbox->{box/1,1}}
+              trace: postponed_configurations::add: merge {bax box | libbox->{bax/2,1 box/1,1} libbar->{bax/2,1}} into {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves non-negotiated configurations and results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?, throwing merge_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1 box/1,1}}?
+              trace: collect_build_postponed (1): begin {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build: add baz/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbox/0.1.0
+              trace: collect_build_prerequisites: end libbox/0.1.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{box/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1}}?
+              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
+              trace: collect_build_prerequisites: dependency libbox/0.1.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
+              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
+              trace: collect_build_prerequisites: end bax/1.0.0
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
+              trace: collect_build_prerequisites: resume baz/1.0.0
+              trace: collect_build_prerequisites: end baz/1.0.0
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent box/0.1.0
+              trace: collect_build_prerequisites: resume box/0.1.0
+              trace: collect_build_prerequisites: end box/0.1.0
+              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ box | libfoo->{bax/1,1 baz/1,1} libbox->{bax/2,1 box/1,1} libbar->{bax/2,1 baz/1,1}}!
+              trace: collect_build_postponed (1): end {bax^ box | libfoo->{bax/1,1} libbox->{box/1,1}}
+              trace: collect_build_postponed (0): end
+              %.*
+              trace: execute_plan: simulate: yes
+              %.*
+              EOE
 
-          $pkg_status -r >>EOO;
-            !bax configured 1.0.0
-              libbar configured 1.0.0
-              libbox configured 0.1.0 available 1.0.0
-              libfoo configured 1.0.0
-            !baz configured 1.0.0
-              libbar configured 1.0.0
-              libfoo configured 1.0.0
-            !box configured !0.1.0 available 1.0.0
-              libbox configured 0.1.0 available 1.0.0
-            EOO
+            $pkg_status -r >>EOO;
+              !bax configured 1.0.0
+                libbar configured 1.0.0
+                libbox configured 0.1.0 available 1.0.0
+                libfoo configured 1.0.0
+              !baz configured 1.0.0
+                libbar configured 1.0.0
+                libfoo configured 1.0.0
+              !box configured !0.1.0 available 1.0.0
+                libbox configured 0.1.0 available 1.0.0
+              EOO
+
+            $pkg_drop bax baz box
+          }
+
+          : bogus-harmless
+          :
+          {
+            $clone_cfg;
+
+            #  Dependencies:
+            #
+            #  bax: depends: libfoo(c)
+            #       depends: {libbox libbar} (c)
+            #
+            #  baz: depends: {libbar libfoo} (c)
+            #
+            $* bax baz 2>!;
 
-          $pkg_drop bax baz box
+            $* libbox/0.1.0 ?baz 2>>~%EOE%;
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              %.*
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of existing dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libbox->{bax/2,1}}
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {bax^ | libbox->{bax/2,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1}}
+              %.*
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: collect_build: add libfoo/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {bax^ 2,1: libbox libbar} to {bax^ | libbox->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libfoo
+              trace: collect_build_postponed (1): cannot re-evaluate dependent bax to dependency index 1 since it is already re-evaluated to greater index 2 in {bax^ baz^ | libbox->{bax/2,1} libbar->{bax/2,1 baz/1,1} libfoo->{baz/1,1}}, throwing postpone_position
+              trace: pkg_build: collection failed due to earlier dependency position, retry from scratch
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              %.*
+              trace: collect_build_prerequisites: replace dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
+              trace: collect_build: add libfoo/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing retry_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to dependent bax, adding shadow dependent and re-negotiating
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}?
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_prerequisites: cfg-postponing dependent bax/1.0.0 involves non-negotiated configurations and results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?, throwing merge_configuration
+              trace: collect_build_postponed (0): cfg-negotiation of {bax^ | libfoo->{bax/1,1}} failed due to non-negotiated clusters, force-merging based on shadow cluster {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build_prerequisites: reeval baz/1.0.0
+              %.*
+              trace: collect_build: add libbar/1.0.0
+              trace: postponed_configurations::add: add {baz^ 1,1: libbar libfoo} to {bax^ | libfoo->{bax/1,1}} (shadow cluster-based)
+              trace: collect_build_prerequisites: re-evaluating dependent baz/1.0.0 results in {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_prerequisites: re-evaluated baz/1.0.0
+              %.*
+              trace: collect_build_postponed (1): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (1): skip being built existing dependent baz of dependency libbar
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: add {bax 2,1: libbox libbar} to {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{baz/1,1}}? (shadow cluster-based)
+              trace: collect_build_prerequisites: dependent bax/1.0.0 is a shadow dependent for {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}?
+              trace: collect_build_prerequisites: configuration for cfg-postponed dependencies of dependent bax/1.0.0 is negotiated
+              trace: collect_build_prerequisites: collecting cfg-postponed dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build_prerequisites: begin libbox/0.1.0
+              trace: collect_build_prerequisites: end libbox/0.1.0
+              trace: collect_build_prerequisites: dependency libbar/1.0.0 of dependent bax/1.0.0 is already (being) recursively collected, skipping
+              trace: collect_build_prerequisites: end bax/1.0.0
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent baz/1.0.0
+              trace: collect_build_prerequisites: resume baz/1.0.0
+              trace: collect_build_prerequisites: end baz/1.0.0
+              trace: collect_build_postponed (1): cfg-negotiate end {bax^ baz^ | libfoo->{bax/1,1 baz/1,1} libbar->{bax/2,1 baz/1,1} libbox->{bax/2,1}}!
+              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): end
+              %.*
+              trace: execute_plan: simulate: yes
+              %.*
+              trace: evaluate_dependency: baz/1.0.0: unused
+              %.*
+              trace: pkg_build: refine package collection/plan execution
+              %.*
+              trace: collect_drop: baz/1.0.0 package version needs to be replaced with drop
+              trace: pkg_build: collection failed due to package version replacement, retry from scratch
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              trace: pkg_build: dep-postpone user-specified libbox
+              trace: collect_drop: overwrite baz
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (0): erase bogus postponement libbox
+              trace: collect_build_postponed (0): bogus postponements erased, throwing
+              trace: pkg_build: collection failed due to bogus dependency collection postponement cancellation, retry from scratch
+              %.*
+              trace: pkg_build: refine package collection/plan execution from scratch
+              %.*
+              trace: collect_build: add libbox/0.1.0
+              %.*
+              trace: collect_build_prerequisites: replace dependency at index 2 of existing dependent bax/1.0.0 with dependency libfoo/1.0.0 at index 1
+              trace: collect_build: add libfoo/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libfoo/1.0.0 of existing dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax^ | libfoo->{bax/1,1}}
+              trace: collect_drop: overwrite baz
+              trace: collect_build_postponed (0): begin
+              trace: collect_build_postponed (1): begin {bax^ | libfoo->{bax/1,1}}
+              %.*
+              trace: collect_build_postponed (1): skip being dropped existing dependent baz of dependency libfoo
+              trace: collect_build_postponed (1): re-evaluate existing dependents for {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build: add bax/1.0.0
+              trace: collect_build_prerequisites: reeval bax/1.0.0
+              %.*
+              trace: postponed_configurations::add: add {bax^ 1,1: libfoo} to {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluating dependent bax/1.0.0 results in {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_prerequisites: re-evaluated bax/1.0.0
+              trace: collect_build_postponed (1): cfg-negotiate begin {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libfoo/1.0.0
+              trace: collect_build_prerequisites: end libfoo/1.0.0
+              trace: collect_build_postponed (1): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (1): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              %.*
+              trace: collect_build: pick libbox/0.1.0 over libbox/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbox/0.1.0 of dependent bax/1.0.0
+              trace: collect_build: add libbar/1.0.0
+              trace: collect_build_prerequisites: cfg-postpone dependency libbar/1.0.0 of dependent bax/1.0.0
+              trace: postponed_configurations::add: create {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_prerequisites: postpone bax/1.0.0
+              trace: collect_build_postponed (1): cfg-negotiate end {bax^ | libfoo->{bax/1,1}}!
+              trace: collect_build_postponed (2): begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
+              %.*
+              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbox
+              %.*
+              trace: collect_build_postponed (2): skip being built existing dependent bax of dependency libbar
+              trace: collect_build_postponed (2): skip being dropped existing dependent baz of dependency libbar
+              trace: collect_build_postponed (2): cfg-negotiate begin {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependencies
+              trace: collect_build_prerequisites: begin libbox/0.1.0
+              trace: collect_build_prerequisites: end libbox/0.1.0
+              trace: collect_build_prerequisites: begin libbar/1.0.0
+              trace: collect_build_prerequisites: end libbar/1.0.0
+              trace: collect_build_postponed (2): recursively collect cfg-negotiated dependents
+              trace: collect_build_postponed (2): select cfg-negotiated dependency alternative for dependent bax/1.0.0
+              trace: collect_build_prerequisites: resume bax/1.0.0
+              trace: collect_build_prerequisites: end bax/1.0.0
+              trace: collect_build_postponed (2): cfg-negotiate end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}!
+              trace: collect_build_postponed (2): end {bax | libbox->{bax/2,1} libbar->{bax/2,1}}
+              trace: collect_build_postponed (1): end {bax^ | libfoo->{bax/1,1}}
+              trace: collect_build_postponed (0): end
+              %.*
+              trace: execute_plan: simulate: yes
+              %.*
+              EOE
+
+            $pkg_status -r >>EOO;
+              !libbox configured !0.1.0 available 1.0.0
+              !bax configured 1.0.0
+                libbar configured 1.0.0
+                !libbox configured !0.1.0 available 1.0.0
+                libfoo configured 1.0.0
+              EOO
+
+            $pkg_drop bax libbox
+          }
         }
       }
     }