Added more descriptive message (issue 116808) (#117201)

The dialogue messages were changed to be more descriptive.

Fixes #116808

Author: tlemy

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1728,9 +1728,9 @@ def err_introducing_special_friend : Error<
 def err_tagless_friend_type_template : Error<
   "friend type templates must use an elaborated type">;
 def err_no_matching_local_friend : Error<
-  "no matching function found in local scope">;
+  "cannot define friend function in a local class definition">;
 def err_no_matching_local_friend_suggest : Error<
-  "no matching function %0 found in local scope; did you mean %3?">;
+  "cannot define friend function %0 in a local class definition; did you mean %3?">;
 def err_partial_specialization_friend : Error<
   "partial specialization cannot be declared as a friend">;
 def err_qualified_friend_def : Error<

clang/test/CXX/class.access/class.friend/p11.cpp

@@ -12,7 +12,7 @@ namespace test0 {
 namespace test1 {
   void foo() {
     class A {
-      friend void bar(); // expected-error {{no matching function found in local scope}}
+      friend void bar(); // expected-error {{cannot define friend function in a local class definition}}
     };
   }
 }
@@ -22,7 +22,7 @@ namespace test2 {
 
   void foo() { // expected-note 2{{'::test2::foo' declared here}}
     struct S1 {
-      friend void foo(); // expected-error {{no matching function 'foo' found in local scope; did you mean '::test2::foo'?}}
+      friend void foo(); // expected-error {{cannot define friend function 'foo' in a local class definition; did you mean '::test2::foo'?}}
     };
 
     void foo(); // expected-note {{local declaration nearly matches}}
@@ -32,24 +32,24 @@ namespace test2 {
 
     {
       struct S2 {
-        friend void foo(); // expected-error {{no matching function found in local scope}}
+        friend void foo(); // expected-error {{cannot define friend function in a local class definition}}
       };
     }
 
     {
       int foo;
       struct S3 {
-        friend void foo(); // expected-error {{no matching function 'foo' found in local scope; did you mean '::test2::foo'?}}
+        friend void foo(); // expected-error {{cannot define friend function 'foo' in a local class definition; did you mean '::test2::foo'?}}
       };
     }
 
     struct S4 {
-      friend void bar(); // expected-error {{no matching function 'bar' found in local scope; did you mean '::test2::bar'?}}
+      friend void bar(); // expected-error {{cannot define friend function 'bar' in a local class definition; did you mean '::test2::bar'?}}
     };
 
     { void bar(); }
     struct S5 {
-      friend void bar(); // expected-error {{no matching function 'bar' found in local scope; did you mean '::test2::bar'?}}
+      friend void bar(); // expected-error {{cannot define friend function 'bar' in a local class definition; did you mean '::test2::bar'?}}
     };
 
     {
@@ -76,16 +76,16 @@ namespace test2 {
 
     struct S9 {
       struct Inner {
-        friend void baz(); // expected-error {{no matching function 'baz' found in local scope; did you mean 'bar'?}}
+        friend void baz(); // expected-error {{cannot define friend function 'baz' in a local class definition; did you mean 'bar'?}}
       };
     };
 
     struct S10 {
       void quux() {}
       void foo() {
         struct Inner1 {
-          friend void bar(); // expected-error {{no matching function 'bar' found in local scope; did you mean '::test2::bar'?}}
-          friend void quux(); // expected-error {{no matching function found in local scope}}
+          friend void bar(); // expected-error {{cannot define friend function 'bar' in a local class definition; did you mean '::test2::bar'?}}
+          friend void quux(); // expected-error {{cannot define friend function in a local class definition}}
         };
 
         void bar();

clang/test/SemaCXX/function-redecl.cpp

@@ -46,7 +46,7 @@ namespace test0 {
   void dummy() {
     void Bar(); // expected-note {{'Bar' declared here}}
     class A {
-      friend void bar(); // expected-error {{no matching function 'bar' found in local scope; did you mean 'Bar'}}
+      friend void bar(); // expected-error {{cannot define friend function 'bar' in a local class definition; did you mean 'Bar'}}
     };
   }
 }