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1// RUN: %clang_cc1 %s -fsyntax-only -verify -fblocks2 3@class NSObject;4typedef void (^block1_t)(int arg);5typedef void (^block2_t)(block1_t arg);6typedef void (^block3_t)(NSObject *arg);7typedef void (^block4_t)(id arg);8 9void fn(block4_t arg); // expected-note {{passing argument to parameter 'arg' here}}10 11void another_fn(block2_t arg);12 13int main(void) {14 block1_t b1;15 block2_t b2;16 block3_t b3;17 block3_t b4;18 block4_t b5;19 20 fn(b1); // expected-error {{incompatible block pointer types passing 'block1_t' (aka 'void (^)(int)') to parameter of type 'block4_t' (aka 'void (^)(id)')}}21 fn(b2); // must succeed: block1_t *is* compatible with id22 fn(b3); // succeeds: NSObject* compatible with id23 fn(b4); // succeeds: id compatible with id24 25 another_fn(b5);26}27