[Bug c++/94162] New: ICE [neg] bad return type in defaulted <=>

[dacamara.cameron at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94162

            Bug ID: 94162
           Summary: ICE [neg] bad return type in defaulted <=>
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dacamara.cameron at gmail dot com
  Target Milestone: ---

Whenever the return type of a defaulted <=> is not a comparison category gcc
ICEs:

#include <compare>

struct S {
  int a;
  bool operator<=>(const S&) const = default;
};

bool b = S{} < S{};

$ gcc -std=c++2a -c t.cpp

t.cpp:5:8: internal compiler error: in genericize_spaceship, at
cp/method.c:1050

    5 |   bool operator<=>(const S&) const = default;

      |        ^~~~~~~~

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