[clang] [clang] Add covariance tests that make sure we return an error when return value is different in pointer / lvalue ref / rvalue ref (PR #112853)

[Boaz Brickner via cfe-commits]

================
@@ -93,6 +93,38 @@ struct B : A {
 } // namespace example2
 } // namespace cwg952
 
+namespace cwg960 { // cwg960: 2.8
+struct a {};
+class A {
+#if __cplusplus >= 201103L
+  // Check lvalue ref vs rvalue ref vs pointer.
+  virtual a& rvalue_ref();
+  virtual a&& lvalue_ref();
+  virtual a& rvalue_vs_lvalue_ref(); // expected-note{{overridden virtual 
function is here}}
+  virtual a&& lvalue_vs_rvalue_ref(); // expected-note{{overridden virtual 
function is here}}
+  virtual a& rvalue_ref_vs_pointer(); // expected-note{{overridden virtual 
function is here}}
+  virtual a* pointer_vs_rvalue_ref(); // expected-note{{overridden virtual 
function is here}}
+  virtual a&& lvalue_ref_vs_pointer(); // expected-note{{overridden virtual 
function is here}}
+  virtual a* pointer_vs_lvalue_ref(); // expected-note{{overridden virtual 
function is here}}
+#endif
+};
+
+class B : A {
+#if __cplusplus >= 201103L
+  // Check lvalue ref vs rvalue ref vs pointer.
+  a& rvalue_ref() override;
+  a&& lvalue_ref() override;
+  a&& rvalue_vs_lvalue_ref() override; // expected-error{{virtual function 
'rvalue_vs_lvalue_ref' has a different return type ('a &&') than the function 
it overrides (which has return type 'a &')}}
----------------
bricknerb wrote:

Thanks!
Done.

https://github.com/llvm/llvm-project/pull/112853
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