https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91241
--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:55f40d968b0bd3be4478a9481e829a99ee0fa04f commit r11-7998-g55f40d968b0bd3be4478a9481e829a99ee0fa04f Author: Jason Merrill <ja...@redhat.com> Date: Mon Apr 5 22:50:44 2021 -0400 c++: mangling of lambdas in default args [PR91241] In this testcase, the parms remembered in LAMBDA_EXPR_EXTRA_SCOPE are no longer the parms of the FUNCTION_DECL they have as their DECL_CONTEXT, so we were mangling both lambdas as parm #0. But since the parms are numbered from right to left we don't need to need to find them in the FUNCTION_DECL, we can measure their own DECL_CHAIN. gcc/cp/ChangeLog: PR c++/91241 * mangle.c (write_compact_number): Add sanity check. (write_local_name): Use list_length for parm number. gcc/testsuite/ChangeLog: PR c++/91241 * g++.dg/abi/lambda-defarg1.C: New test.
