[Bug c++/116952] [13/14/15/16 Regression] Error on lambda NTTP argument to type constraint in template parameter list of generic lambda

Thu, 08 Jan 2026 23:04:21 -0800 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116952

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Jason Merrill
<[email protected]>:

https://gcc.gnu.org/g:66fe4ac0fa6efaa7213d6c6afd9e7ea77688e072

commit r15-10658-g66fe4ac0fa6efaa7213d6c6afd9e7ea77688e072
Author: Eczbek <[email protected]>
Date:   Fri Jan 9 15:02:53 2026 +0800

    c++: Allow lambda expressions in template type parameters [PR116952]

            PR c++/116952

    gcc/cp/ChangeLog:

            * parser.cc (cp_parser_lambda_expression): Revert
            r11-8166-ge1666ebd9ad31d change prohibiting lambda in non-type
            parameter.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/lambda-uneval14.C: Revise incorrect test.
            * g++.dg/cpp2a/lambda-uneval29.C: New test.

    Co-authored-by: Jason Merrill <[email protected]>
    (cherry picked from commit ef4cd115ef67736b2af06fb7b47410961b73e7d6)

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