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-rw-r--r--build2/utility.hxx4
1 files changed, 3 insertions, 1 deletions
diff --git a/build2/utility.hxx b/build2/utility.hxx
index cc34d59..b75cb5a 100644
--- a/build2/utility.hxx
+++ b/build2/utility.hxx
@@ -280,7 +280,9 @@ namespace build2
//
// The predicate can move the value out of the passed string but, if error
// is false, only in case of a "content match" (so that any diagnostics
- // lines are left intact).
+ // lines are left intact). The function signature should be:
+ //
+ // T (string& line, bool last)
//
// If ignore_exit is true, then the program's exist status is ignored (if it
// is false and the program exits with the non-zero status, then an empty T