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16 lines
817 B
16 lines
817 B
5 years ago
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This error type is reported in C and Objective-C. In many variadic methods,
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`nil` is used to signify the end of the list of input objects. This is similar
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to nil-termination of C strings. If one of the arguments that is not the last
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argument to the method is `nil` as well, Infer reports an error because that may
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lead to unexpected behavior.
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An example of such variadic methods is
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[arrayWithObjects](https://developer.apple.com/library/prerelease/ios/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/index.html#//apple_ref/occ/clm/NSArray/arrayWithObjects)
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```objectivec
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NSArray *foo = [NSArray arrayWithObjects: @"aaa", str, @"bbb", nil];
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```
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In this example, if `str` is `nil` then an array `@[@"aaa"]` of size 1 will be
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created, and not an array `@[@"aaa", str, @"bbb"]` of size 3 as expected.
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