[Bug c++/83583] New: ICE in synthesize_implicit_template_parm, at cp/parser.c:38794

[wouter at voti dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83583

            Bug ID: 83583
           Summary: ICE in synthesize_implicit_template_parm, at
                    cp/parser.c:38794
           Product: gcc
           Version: 7.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wouter at voti dot nl
  Target Milestone: ---

The compiler ICE's on this construct. There are some simular bug reports which
might be the same problem or a related one, but they report a different
parser.c line.

using  arm-eabi-gcc (GCC) 7.2.0 -fconcepts

code:

    template< typename T > 
    concept bool has_main = requires {
       { T::main() } -> void;   
    };  

    template< typename T >
    concept bool is_duration_with_polling = requires (
       has_main m
    ){ 
       { template callback< m >::init() } -> void
    };