[Bug c++/100101] [11 Regression] ICE with -Wzero-as-null-pointer-constant

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100101

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/cp/error.c.jj   2021-02-25 23:27:46.561918450 +0100
+++ gcc/cp/error.c      2021-04-15 19:10:38.389850343 +0200
@@ -1554,10 +1554,12 @@ find_typenames_r (tree *tp, int *walk_su
     /* Add the typename without any cv-qualifiers.  */
     mv = TYPE_MAIN_VARIANT (*tp);

-  if (PACK_EXPANSION_P (*tp))
+  if (PACK_EXPANSION_P (*tp) || EXPR_P (*tp))
     {
       /* Don't mess with parameter packs since we don't remember
-        the pack expansion context for a particular typename.  */
+        the pack expansion context for a particular typename.
+        Similarly, don't walk into expressions such as
+        those inside of TYPE_RAISES_EXCEPTIONS.  */
       *walk_subtrees = false;
       return NULL_TREE;
     }
passed make check-c++-all and fixes the testcase.