================
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -std=c++20 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+// Ensure the following out of line friend declaration doesn't cause the 
compiler to crash.
+
+class A {
+  friend bool operator==(const A&, const A&);
+  friend class B;
+};
+
+bool operator==(const A&, const A&) = default;
+
----------------
GrumpyPigSkin wrote:

Ahh okay, what is the other test? I was messing around and found a test that 
passes on clang and fails on gcc/msvc, 
https://compiler-explorer.com/z/5ve41Mo9b, I don't see why it shouldn't pass on 
the other two. What other tests do you think are worth implementing?

https://github.com/llvm/llvm-project/pull/121056
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