1 files changed, 20 insertions, 0 deletions
diff --git a/test/SemaObjC/id.m b/test/SemaObjC/id.m
new file mode 100644
index 0000000..1781ce7
--- /dev/null
+++ b/test/SemaObjC/id.m
@@ -0,0 +1,20 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+
+@protocol Foo;
+
+Class T;
+id<Foo> S;
+id R;
+void foo() {
+  // Test assignment compatibility of Class and id.  No warning should be
+  // produced.
+  // rdar://6770142 - Class and id<foo> are compatible.
+  S = T; T = S;
+  R = T; T = R;
+  R = S; S = R;
+}
+
+// Test attempt to redefine 'id' in an incompatible fashion.
+typedef int id;   // expected-error {{typedef redefinition with different types}}
+id b;
+