https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108975
--- Comment #14 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:55ab4606ab1084a55d53184c5cf4543740a7f65d commit r12-9440-g55ab4606ab1084a55d53184c5cf4543740a7f65d Author: Jason Merrill <ja...@redhat.com> Date: Fri Mar 17 17:26:40 2023 -0400 c++: constant, array, lambda, template [PR108975] When a lambda refers to a constant local variable in the enclosing scope, we tentatively capture it, but if we end up pulling out its constant value, we go back at the end of the lambda and prune any unneeded captures. Here while parsing the template we decided that the dim capture was unneeded, because we folded it away, but then we brought back the use in the template trees that try to preserve the source representation with added type info. So then when we tried to instantiate that use, we couldn't find what it was trying to use, and crashed. Fixed by not trying to prune when parsing a template; we'll prune at instantiation time. PR c++/108975 gcc/cp/ChangeLog: * lambda.cc (prune_lambda_captures): Don't bother in a template. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/lambda/lambda-const11.C: New test.
