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      1 // RUN: %clang_cc1 -fsyntax-only -verify %s
      2 
      3 @protocol Foo;
      4 
      5 Class T;
      6 id<Foo> S;
      7 id R;
      8 void foo() {
      9   // Test assignment compatibility of Class and id.  No warning should be
     10   // produced.
     11   // rdar://6770142 - Class and id<foo> are compatible.
     12   S = T; // expected-warning {{incompatible pointer types assigning to 'id<Foo>' from 'Class'}}
     13   T = S; // expected-warning {{incompatible pointer types assigning to 'Class' from 'id<Foo>'}}
     14   R = T; T = R;
     15   R = S; S = R;
     16 }
     17 
     18 // Test attempt to redefine 'id' in an incompatible fashion.
     19 typedef int id;  // FIXME: Decide how we want to deal with this (now that 'id' is more of a built-in type).
     20 id b;
     21 
     22