================
@@ -5164,6 +5164,29 @@ namespace A {
A::X x;
#endif
+namespace TemplateDecltypeOperator {
+
+#if defined(FIRST) || defined(SECOND)
+template <class T6>
+T6 func();
+#endif
+
+#if defined(SECOND)
+template <class UnrelatedT>
+using UnrelatedAlias = decltype(func<UnrelatedT>())();
+#endif
+
+#if defined(FIRST) || defined(SECOND)
+class A {
----------------
ilya-biryukov wrote:
Could you add a comment to this test that points to this PR/GitHub issue and
mentions that we need to make sure despite the fact that `decltype(e)` gets
canonicalized to `decltype(e_0)` where `e_0` can potentially have different
template parameter names. Therefore, we need to ensure their ODR hashes are the
same across multiple modules?
It might prove helpful in the future if somebody decides to reassess the
choices made here and choose different trade-offs.
https://github.com/llvm/llvm-project/pull/144796
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