https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86918
Bug ID: 86918 Summary: internal compiler error: unexpected expression 'v' of kind template_parm_index Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: v.reshetnikov at gmail dot com Target Milestone: --- /****************** BEGIN SOURCE ******************/ template<class> struct S { template<bool...> struct X; }; template<> template<bool v> struct S<int>::X { static constexpr bool value = v; }; static_assert(S<int>::X<true>::value); /******************* END SOURCE *******************/ <source>: In instantiation of 'struct S<int>::X<true>': <source>:13:30: required from here <source>:9:18: internal compiler error: unexpected expression 'v' of kind template_parm_index 9 | struct S<int>::X { | ^