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[Bug c++/71075] New: Broken diagnostic: 'integer_cst' not supported by 'dump_decl'


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71075

            Bug ID: 71075
           Summary: Broken diagnostic: 'integer_cst' not supported by
                    'dump_decl'
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arthur.j.odwyer at gmail dot com
  Target Milestone: ---

I'm not sure how this isn't a duplicate of
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51229 , but that bug has been
marked RESOLVED FIXED since 2011, and this bug still reproduces in GCC 7.0.

template<typename T, int I> struct A {};
template<typename T> void foo(A<T,1>) {}
int main() {
    foo(A<int,2>());
}

====

prog.cc: In function 'int main()':
prog.cc:4:19: error: no matching function for call to 'foo(A<int, 2>)'
     foo(A<int,2>());
                   ^
prog.cc:2:27: note: candidate: template<class T> void foo(A<T, 1>)
 template<typename T> void foo(A<T,1>) {}
                           ^~~
prog.cc:2:27: note:   template argument deduction/substitution failed:
prog.cc:4:19: note:   template argument '2' does not match '#'integer_cst' not
supported by dump_decl#<declaration error>'
     foo(A<int,2>());
                   ^

====

Notice the last diagnostic line above: "template argument '2' does not match
'#'integer_cst' not supported by dump_decl#<declaration error>'".

I think GCC is correct in rejecting the input program; it just doesn't
understand how to print the resulting diagnostic.

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