================
@@ -1429,6 +1429,22 @@ operator<<(const StreamingDiagnostic &DB, T *DC) {
return DB;
}
+// Convert scope enums to their underlying type, so that we don't have
+// clutter the emitting code with `llvm::to_underlying()`.
+// We also need to disable implicit conversion for the first argument,
+// because classes that derive from StreamingDiagnostic define their own
+// templated operator<< that accept a wide variety of types, leading
+// to ambiguity.
+template <typename T, typename U>
+inline std::enable_if_t<
+ std::is_same_v<std::remove_const_t<T>, StreamingDiagnostic> &&
+ llvm::is_scoped_enum_v<std::remove_reference_t<U>>,
----------------
Endilll wrote:
I checked that `const` qualifier doesn't get in the way, and that's what we do
in other similar cases. Happy to be proven wrong by buildbots.
https://github.com/llvm/llvm-project/pull/138089
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