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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.
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