https://gcc.gnu.org/g:a4f980e837f0d2cc8fccd026570f92d3830d788b
commit r13-9425-ga4f980e837f0d2cc8fccd026570f92d3830d788b
Author: Marek Polacek <pola...@redhat.com>
Date: Fri Mar 7 11:26:46 2025 -0500
c++: ICE with lambda in fold expression in requires [PR119134]
The r12-8258 fix assumes that DECL_CONTEXT of 'pack' in
check_for_bare_parameter_packs is going to be an operator()
but as this test shows, it can be empty.
PR c++/119134
gcc/cp/ChangeLog:
* pt.cc (check_for_bare_parameter_packs): Check DECL_CONTEXT.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/lambda-uneval24.C: New test.
Reviewed-by: Jason Merrill <ja...@redhat.com>
(cherry picked from commit 0e47062ce70d147091f1a97ec94bd6efad92bc5e)
Diff:
---
gcc/cp/pt.cc | 1 +
gcc/testsuite/g++.dg/cpp2a/lambda-uneval24.C | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index bb53d9881405..54b145cedc4b 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -4334,6 +4334,7 @@ check_for_bare_parameter_packs (tree t, location_t loc /*
= UNKNOWN_LOCATION */)
tree pack = TREE_VALUE (parameter_packs);
if (is_capture_proxy (pack)
|| (TREE_CODE (pack) == PARM_DECL
+ && DECL_CONTEXT (pack)
&& DECL_CONTEXT (DECL_CONTEXT (pack)) == lam))
break;
}
diff --git a/gcc/testsuite/g++.dg/cpp2a/lambda-uneval24.C
b/gcc/testsuite/g++.dg/cpp2a/lambda-uneval24.C
new file mode 100644
index 000000000000..a2b45595e479
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/lambda-uneval24.C
@@ -0,0 +1,4 @@
+// PR c++/119134
+// { dg-do compile { target c++20 } }
+
+void f(auto... args) requires(([args] {}, ..., true)) {}
