https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117518
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Jason Merrill <[email protected]>: https://gcc.gnu.org/g:4d02f20772f170b78491769a78086c92de127f95 commit r16-6352-g4d02f20772f170b78491769a78086c92de127f95 Author: Egas Ribeiro <[email protected]> Date: Fri Dec 19 16:58:58 2025 +0000 c++: Fix ICE with lambdas combining explicit and implicit template params [PR117518] When a lambda with explicit template parameters like []<int> also has implicit template parameters from auto, and is used as a default template argument, processing_template_parmlist remained set from the outer template context. This caused function_being_declared_is_template_p to incorrectly return false, leading synthesize_implicit_template_parm to create a new template scope instead of extending the existing one, resulting in a binding level mismatch and an ICE in poplevel_class. Fix by clearing processing_template_parmlist in cp_parser_lambda_expression alongside the other parser state save/restore operations. PR c++/117518 gcc/cp/ChangeLog: * parser.cc (cp_parser_lambda_expression): Clear processing_template_parmlist when parsing lambda body. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/lambda-targ19.C: New test. Signed-off-by: Egas Ribeiro <[email protected]> Reviewed-by: Jason Merrill <[email protected]>
