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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/103572] New: [11/12 Regression] ICE in build_function_type
 after undefined type as a template argument during class template argument
 deduction
Date: Mon, 06 Dec 2021 08:38:48 +0000
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X-Bugzilla-Keywords: error-recovery, ice-on-invalid-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103572

            Bug ID: 103572
           Summary: [11/12 Regression] ICE in build_function_type after
                    undefined type as a template argument during class
                    template argument deduction
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: error-recovery, ice-on-invalid-code
          Severity: trivial
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Reduced testcase:
template <view_concept urng_t>
class view
{
  view(view const & rhs) =3D default;
};
view v1(0);

---- CUT ----
GCC 10 did not ICE:
<source>:1:11: error: 'view_concept' has not been declared
    1 | template <view_concept urng_t>
      |           ^~~~~~~~~~~~
<source>:6:10: error: class template argument deduction failed:
    6 | view v1(0);
      |          ^
<source>:6:10: error: no matching function for call to 'view(int)'
<source>:4:3: note: candidate: 'template<<declaration error> > view(const
view<<declaration error> >&)-> view<<declaration error> >'
    4 |   view(view const & rhs) =3D default;
      |   ^~~~
<source>:4:3: note:   template argument deduction/substitution failed:
<source>:2:7: note: candidate: 'template<<declaration error> >
view(view<<declaration error> >)-> view<<declaration error> >'
    2 | class view
      |       ^~~~
<source>:2:7: note:   template argument deduction/substitution failed:=