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From: "ensadc at mailnesia dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98767] Function signature lost in concept diagnostic message
Date: Mon, 25 Jan 2021 13:30:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98767

ensadc at mailnesia dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ensadc at mailnesia dot com

--- Comment #1 from ensadc at mailnesia dot com ---
The parameter list is printed by `pp_cxx_parameter_declaration_clause` defi=
ned
in gcc/cp/cxx-pretty-print.c
(https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dblob;f=3Dgcc/cp/cxx-pretty-print.=
c;h=3Da22eea5239c33ed946abe46539e588b04e7beca7;hb=3DHEAD#l1538
), where the parameter types are printed in a loop that starts with:

>    for (; args; args =3D TREE_CHAIN (args), types =3D TREE_CHAIN (types))

Here `args` was initialized with:

>       args =3D type_p ? NULL : FUNCTION_FIRST_USER_PARM (t);

It seems that when a type is passed to `pp_cxx_parameter_declaration_clause=
`,
`args` is always set to NULL, and the loop is never entered.=