https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95728
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:81caacc273399c91ae3182021ad87bc2ba786039 commit r11-1507-g81caacc273399c91ae3182021ad87bc2ba786039 Author: Marek Polacek <pola...@redhat.com> Date: Wed Jun 17 19:23:10 2020 -0400 c++: Fix tsubst ICE with invalid static_cast [PR95728] Since r11-423 tsubst_copy_and_build/TREE_LIST uses tsubst_tree_list instead of open coding it. While the latter could return an error node wrapped in a TREE_LIST, the former can return a naked error node. That broke in tsubst_copy_and_build/NEW_EXPR: tree placement = RECUR (TREE_OPERAND (t, 0)); // placement is now error_mark_node, so... for (; placement != NULL_TREE; placement = TREE_CHAIN (placement)) // ... this crashes If we just return, we avoid the ICE and improve the diagnostic a bit. gcc/cp/ChangeLog: PR c++/95728 * pt.c (tsubst_copy_and_build) <case NEW_EXPR>: Return error_mark_node if placement is erroneous. gcc/testsuite/ChangeLog: PR c++/95728 * g++.dg/template/cast6.C: New test.
