From fc84d5b527a17a5360d375ade4cdc17e4f8a6b88 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 4 Dec 2023 08:22:15 +0200
Subject: Improve parser diagnostics

---
 libbuild2/parser.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libbuild2/parser.cxx b/libbuild2/parser.cxx
index 2417ea5..3caf097 100644
--- a/libbuild2/parser.cxx
+++ b/libbuild2/parser.cxx
@@ -4427,7 +4427,7 @@ namespace build2
         // is not an option. So let's skip it.
         //
         if (taken)
-          skip_line (t, tt);
+          skip_line (t, tt); // Skip expression.
         else
         {
           if (tt == type::newline || tt == type::eos)
@@ -4489,6 +4489,10 @@ namespace build2
       }
       else if (!multi) // No lines in multi-curly if-else.
       {
+        if (tt == type::multi_lcbrace)
+          fail (t) << "expected " << k << "-line instead of " << t <<
+            info << "did you forget to specify % recipe header?";
+
         if (take)
         {
           if (!parse_clause (t, tt, true))
-- 
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