amykhuang wrote:
Hi, this is causing failures for Chrome, building with c++20:
```
$ cat t.cc
template <typename Type> class StrongAlias {
friend constexpr bool operator==(const StrongAlias &, const StrongAlias &) =
default;
Type value;
};
class Token {};
bool operator==(const Token&, const Token&);
StrongAlias<Token> a;
$ clang -std=c++20 t.cc
t.cc:2:3: error: defaulted definition of equality comparison operator cannot be
declared constexpr because it invokes a non-constexpr comparison function
2 | friend constexpr bool operator==(const StrongAlias &, const
StrongAlias &) = default;
| ^
t.cc:9:20: note: in instantiation of template class 'StrongAlias<Token>'
requested here
9 | StrongAlias<Token> a;
| ^
t.cc:3:8: note: non-constexpr comparison function would be used to compare
member 'value'
3 | Type value;
| ^
t.cc:7:6: note: non-constexpr comparison function declared here
7 | bool operator==(const Token&, const Token&);
| ^
1 error generated.
```
https://github.com/llvm/llvm-project/pull/77753
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