PR7256: Provide a fixit for incorrect destructor declarations

Fix by Ismail Pazarbasi (ismail.pazarbasi@gmail.com), review by Dmitri Gribenko.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177546 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 09f04b7..4b426bf 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -264,8 +264,16 @@
   } else if (ObjectTypePtr)
     Diag(NameLoc, diag::err_ident_in_dtor_not_a_type)
       << &II;
-  else
-    Diag(NameLoc, diag::err_destructor_class_name);
+  else {
+    SemaDiagnosticBuilder DtorDiag = Diag(NameLoc,
+                                          diag::err_destructor_class_name);
+    if (S) {
+      const DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
+      if (const CXXRecordDecl *Class = dyn_cast_or_null<CXXRecordDecl>(Ctx))
+        DtorDiag << FixItHint::CreateReplacement(SourceRange(NameLoc),
+                                                 Class->getNameAsString());
+    }
+  }
 
   return ParsedType();
 }