PR4103: Silence bogus unused expression warning.

llvm-svn: 70384

clang/lib/AST/Expr.cpp

@@ -500,7 +500,8 @@ bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1,
     return true;
 
   case CallExprClass:
-  case CXXOperatorCallExprClass: {
+  case CXXOperatorCallExprClass:
+  case CXXMemberCallExprClass: {
     // If this is a direct call, get the callee.
     const CallExpr *CE = cast<CallExpr>(this);
     const Expr *CalleeExpr = CE->getCallee()->IgnoreParenCasts();

clang/test/SemaCXX/unused.cpp

@@ -0,0 +1,15 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+// PR4103 : Make sure we don't get a bogus unused expression warning
+class APInt {
+  char foo;
+};
+class APSInt : public APInt {
+  char bar;
+public:
+  APSInt &operator=(const APSInt &RHS);
+};
+
+APSInt& APSInt::operator=(const APSInt &RHS) {
+  APInt::operator=(RHS);
+  return *this;
+}