[NFC] Add test cases reported in PR54341

[mizvekov]

Summary

Signed-off-by: Matheus Izvekov <[e-mail]>

[mizvekov]

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[mizvekov]

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clang/test/CXX/class/class.init/class.copy.elision/p3.cpp

 
 // Operand of throw-expression can be function parameter or
 // catch-clause parameter.
 namespace test_throw_parameter {
 void func();
 
 struct A1 {
   A1(const A1 &);
-  A1(A1 &&) = delete; // expected-note 2{{'A1' has been explicitly marked deleted here}}
+  A1(A1 &&) = delete;
+  // expected-note@-1 2{{'A1' has been explicitly marked deleted here}}
+  // cxx11_2b-note@-2 {{'A1' has been explicitly marked deleted here}}
 };
 void test1() {
   try {
     func();
   } catch (A1 a) {
     throw a; // expected-error {{call to deleted constructor of 'test_throw_parameter::A1'}}
   }
 }
void test2() {
   }
 }
 
 void test3(A1 a) try {
   func();
 } catch (...) {
   throw a; // expected-error {{call to deleted constructor of 'test_throw_parameter::A1'}}
 }
+
+#if __cplusplus >= 201103L
+namespace PR54341 {
+  void test4(A1 a) {
+    void f(decltype((throw a, 0)));
+    // expected-warning@-1 {{has no effect}}
+
+    void g(int = decltype(throw a, 0){});
+    // expected-warning@-1 {{has no effect}}
+  }
+
+  void test5(A1 a, int = decltype(throw a, 0){}) {}
+  // expected-error@-1 {{call to deleted constructor of 'test_throw_parameter::A1'}}
+} // namespace PR54341
+#endif
+
 } // namespace test_throw_parameter
 
 // During the first overload resolution, the selected function no
 // need to be a constructor.
 namespace test_non_ctor_conversion {
 class C {};
 
 struct A1 {