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Subject: [Bug c++/94521] Infinite loop with decltype of function parameter of
 type decltype([]{})
Date: Thu, 25 Feb 2021 21:45:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94521

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:7fb9a1e929db520fd741e60d84ec1a58581a8299

commit r11-7406-g7fb9a1e929db520fd741e60d84ec1a58581a8299
Author: Patrick Palka <ppalka@redhat.com>
Date:   Thu Feb 25 16:44:34 2021 -0500

    c++: Fix pretty printing the context of local class [PR99213]

    My r10-7705 patch for PR94521 made us set TFF_NO_FUNCTION_ARGUMENTS when
    pretty printing the function scope of a local class type in order to
    eliminate infinite recursion with a function signature that contains
    decltype([]{}).  But due to the way dump_function_decl works, this
    change regressed our pretty printing of local class types whose context
    contains a class template specialization, as in the testcase below, in
    which we wrongly pretty print the two local types as 'A<T>::f<char>::S1'
    and 'B<T>::f<int>::S2'.

    This patch makes dump_scope pass TFF_NO_TEMPLATE_BINDINGS instead of
    TFF_NO_FUNCTION_ARGUMENTS when pretty printing a function scope.  It
    appears this is the strictly better flag to use: it avoids the infinite
    recursion issue, it restores pretty printing of the function parameter
    list, and it stops dump_function_decl from trying to print a function
    template specialization in its own weird way.

    Summary of pretty printing differences for the below testcase:

      r10-7704:   A<T>::f() [with U =3D char; T =3D int]::S1
                  B<T>::f() [with T =3D int]::S2

      r10-7705:   A<T>::f<char>::S1
                  B<T>::f<int>::S2

      this patch: A<int>::f<char>()::S1
                  B<int>::f()::S2

    gcc/cp/ChangeLog:

            PR c++/99213
            PR c++/94521
            * error.c (dump_scope): Pass TFF_NO_TEMPLATE_BINDINGS instead of
            TFF_NO_FUNCTION_ARGUMENTS when dumping a function scope.

    gcc/testsuite/ChangeLog:

            PR c++/99213
            PR c++/94521
            * g++.dg/diagnostic/local1.C: New test.=