https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119574
--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-14 branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:ff5fdb3cad1a76768406e0fcec2010cdd72f49fc commit r14-11577-gff5fdb3cad1a76768406e0fcec2010cdd72f49fc Author: Patrick Palka <ppa...@redhat.com> Date: Wed Apr 9 17:55:36 2025 -0400 c++: ICE with nested default targ lambdas [PR119574] In GCC 14 we fixed PR116567 in a more conservative way that doesn't distinguish between the two kinds of deferred substitutions, and so for PR119574 we instead ICE from get_innermost_template_args due to TMPL_PARMS_DEPTH of the lambda, 2, being greater than the depth of the augmented args, 1. This patch works around the ICE in a best effort kind of way by guarding the get_innermost_template_args call appropriately; I don't think it's possible to get this completely right in GCC 14 without backporting the proper fix for PR116567. Note that lambda-targ13b.C present in the GCC 15 version of this patch[1] never worked in GCC 14, and still doesn't work, which is why it's not present in this patch. [1]: r15-9350-gf3862ab07943d1 PR c++/119574 gcc/cp/ChangeLog: * pt.cc (tsubst_lambda_expr): Don't call get_innermost_template_args if we're requesting too many levels. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/lambda-targ13.C: New test. * g++.dg/cpp2a/lambda-targ13a.C: New test.
