[Bug c++/90782] New: internal compiler error: in dependent_type_p, at cp/pt.c:25409

[getchar_gnu at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90782

            Bug ID: 90782
           Summary: internal compiler error: in dependent_type_p, at
                    cp/pt.c:25409
           Product: gcc
           Version: 9.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: getchar_gnu at hotmail dot com
  Target Milestone: ---

https://gcc.godbolt.org/z/rM-dZg

-std=c++17 -m64

template<class R=void, class... A>
struct bar {
    template<class B>
    bar(B& obj, R(B::*f)(A...)const=B::operator()){}
};
template<class R=void, class... A, class B> void foo(B& obj,
R(B::*f)(A...)const=B::operator()){}
int main() {
    const auto f1 = [](){return 3;};
    //foo(f1);
    bar f8(f1);
}

<source>: In function 'bar(B&, R (B::*)(A ...) const)-> bar<R, A> [with R =
void; A = {}; B = const main()::<lambda()>]':
<source>:10:14: internal compiler error: in dependent_type_p, at cp/pt.c:25409
   10 |     bar f8(f1);
      |              ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1