1 files changed, 30 insertions, 18 deletions
diff --git a/test/SemaCXX/unused.cpp b/test/SemaCXX/unused.cpp
index 88783ce..54898c8 100644
--- a/test/SemaCXX/unused.cpp
+++ b/test/SemaCXX/unused.cpp
@@ -1,24 +1,36 @@
 // RUN: %clang_cc1 -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);
-};
+namespace PR4103 {
+  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;
-}
+  APSInt& APSInt::operator=(const APSInt &RHS) {
+    APInt::operator=(RHS);
+    return *this;
+  }
 
-template<typename T>
-struct X {
-  X();
-};
+  template<typename T>
+  struct X {
+    X();
+  };
+
+  void test() {
+    X<int>();
+  }
+}
 
-void test() {
-  X<int>();
+namespace derefvolatile {
+  void f(volatile char* x) {
+    *x; // expected-warning {{expression result unused; assign into a variable to force a volatile load}}
+    (void)*x; // expected-warning {{expression result unused; assign into a variable to force a volatile load}}
+    volatile char y = 10;
+    (void)y; // don't warn here, because it's a common pattern.
+  }
 }