https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119175
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:e13143ab02172adf7b9a4a848c5c17f62579b9cf commit r14-11592-ge13143ab02172adf7b9a4a848c5c17f62579b9cf Author: Jason Merrill <ja...@redhat.com> Date: Wed Apr 9 13:22:56 2025 -0400 c++: lambda in constraint of lambda [PR119175] Here when we went to mangle the constraints of from<0>, the outer lambda has no mangling scope, but the inner one was treated as having the outer one as its scope. And mangling the outer one means mangling its constraints, which include the inner one. So infinite recursion. But a lambda closure type isn't a scope that anything should have for mangling, the inner lambda should also have no mangling scope. PR c++/119175 gcc/cp/ChangeLog: * mangle.cc (decl_mangling_context): Look through lambda type. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-lambda23.C: New test. (cherry picked from commit 39892d9618ee0f06dd09271589878b0df7b1e75d)
