1// RUN: clang-cc -fsyntax-only -verify -pedantic %s
2@protocol NSObject
3@end
4
5@protocol DTOutputStreams <NSObject>
6@end
7
8@interface DTFilterOutputStream <DTOutputStreams>
9- nextOutputStream;
10@end
11
12@implementation DTFilterOutputStream
13- (id)initWithNextOutputStream:(id <DTOutputStreams>) outputStream {
14  id <DTOutputStreams> nextOutputStream = [self nextOutputStream];
15  self = nextOutputStream;
16  return nextOutputStream ? nextOutputStream : self;
17}
18- nextOutputStream {
19  return self;
20}
21@end
22
23@interface DTFilterOutputStream2
24- nextOutputStream;
25@end
26
27@implementation DTFilterOutputStream2 // expected-warning {{incomplete implementation}} expected-warning {{method definition for 'nextOutputStream' not found}}
28- (id)initWithNextOutputStream:(id <DTOutputStreams>) outputStream {
29  id <DTOutputStreams> nextOutputStream = [self nextOutputStream];
30  // GCC warns about both of these.
31  self = nextOutputStream; // expected-warning {{incompatible type assigning 'id<DTOutputStreams>', expected 'DTFilterOutputStream2 *'}}
32  return nextOutputStream ? nextOutputStream : self;
33}
34@end
35
36// No @interface declaration for DTFilterOutputStream3
37@implementation DTFilterOutputStream3 // expected-warning {{cannot find interface declaration for 'DTFilterOutputStream3'}}
38- (id)initWithNextOutputStream:(id <DTOutputStreams>) outputStream {
39  id <DTOutputStreams> nextOutputStream = [self nextOutputStream]; // expected-warning {{method '-nextOutputStream' not found (return type defaults to 'id')}}
40  // GCC warns about both of these as well (no errors).
41  self = nextOutputStream; // expected-warning {{incompatible type assigning 'id<DTOutputStreams>', expected 'DTFilterOutputStream3 *'}}
42  return nextOutputStream ? nextOutputStream : self;
43}
44@end
45