/*
* Copyright (c) 2014 - present Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/

#import <Foundation/NSObject.h>

@interface A : NSObject
@end


@implementation A {

    void (^_block_field)(void);
}


- (void)doSomethingThenCallback:( void(^)(void) ) my_block
{
    // null dereference, segfault
    my_block();

}


- (void) foo {
    
    void (^my_block)(void)=^() {};
    my_block = NULL;
    my_block(); // Null deref
    
}


- foo2: ( void(^)(void) ) my_block {
  // ok to call this block!
  if(my_block != nil) {
    my_block();
}

}


- (void) foo3: ( void(^)(void) ) my_block {
    
    my_block = NULL;
    my_block(); //Null deref
    
}

- (void) foo4: ( void(^)(void) ) my_block_param {
    
    void (^my_block)(void)=^() {};
    my_block = NULL;
    my_block_param = my_block;
    my_block_param(); //Null deref
    
}

- (void) foo5: ( void(^)(void) ) my_block_param {
    
    void (^my_block)(void)=^() {};
    my_block_param = my_block;
    my_block_param(); //No error here
    
}


- (void) foo6: (BOOL)a block_param: ( void (^)(void)) block_param {
    
    void (^my_block)(void)=^() {
        if (block_param)
            block_param(); //No error here
        
    };
    
    if (a){
        [self foo2: ^() {
            my_block(); // No error here
        }];
    }
    
}

- (void) foo7 {
    
        _block_field(); // Ivar not nullable

}

@end