Here we're crashing from verify_sequence_points for this requires-expr
condition because it contains a templated CAST_EXPR with empty operand,
and verify_tree doesn't ignore this empty operand only because the
manual tail recursion that it perform for unary expression trees skips
the NULL test.
Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
10/11/trunk?
PR c++/105304
gcc/c-family/ChangeLog:
* c-common.cc (verify_tree) [restart]: Move up to before the
NULL test.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-requires30.C: New test.
---
gcc/c-family/c-common.cc | 2 +-
gcc/testsuite/g++.dg/cpp2a/concepts-requires30.C | 10 ++++++++++
2 files changed, 11 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/cpp2a/concepts-requires30.C
diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-common.cc
index 70f55f3a346..bb0544eeaea 100644
--- a/gcc/c-family/c-common.cc
+++ b/gcc/c-family/c-common.cc
@@ -2009,12 +2009,12 @@ verify_tree (tree x, struct tlist **pbefore_sp, struct
tlist **pno_sp,
enum tree_code code;
enum tree_code_class cl;
+ restart:
/* X may be NULL if it is the operand of an empty statement expression
({ }). */
if (x == NULL)
return;
- restart:
code = TREE_CODE (x);
cl = TREE_CODE_CLASS (code);
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-requires30.C
b/gcc/testsuite/g++.dg/cpp2a/concepts-requires30.C
new file mode 100644
index 00000000000..f500af3f616
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-requires30.C
@@ -0,0 +1,10 @@
+// PR c++/105304
+// { dg-do compile { target c++20 } }
+// { dg-additional-options "-Wall -Wsequence-point" }
+
+struct A { };
+
+int main() {
+ if (requires { A(); })
+ ;
+}
--
2.36.0.rc2.10.g1ac7422e39
