When diagnosing that a defaulted function is ill-formed because it would be

implicitly deleted and overrides a non-deleted function, explain why the
function is deleted. For PR30844.

llvm-svn: 285610

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 518a780a4ea..2c743673f69 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -13850,7 +13850,7 @@ void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
 
   // See if we're deleting a function which is already known to override a
   // non-deleted virtual function.
-  if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
+  if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) {
     bool IssuedDiagnostic = false;
     for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
                                         E = MD->end_overridden_methods();
@@ -13863,6 +13863,11 @@ void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) {
         Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
       }
     }
+    // If this function was implicitly deleted because it was defaulted,
+    // explain why it was deleted.
+    if (IssuedDiagnostic && MD->isDefaulted())
+      ShouldDeleteSpecialMember(MD, getSpecialMember(MD), nullptr,
+                                /*Diagnose*/true);
   }
 
   // C++11 [basic.start.main]p3: