No warning when assigning array and dictionary literals with mismatched Objective-C generic types

Originator:heath.borders
Number:rdar://25060756 Date Originated:09-Mar-2016 10:58 AM
Status:Open Resolved:
Product:Developer Tools Product Version:Version 7.2 (7C68)
Classification:Serious Bug Reproducible:Always
 
Summary:
The compiler doesn’t warn when assigning an array or dictionary literal.

Steps to Reproduce:
Compile the following:
    NSArray<NSString *> *noWarningStrings = @[@1,
                                                                                 @2,
                                                                                 @3,
                                                                                 ];
    NSDictionary<NSString *, NSString *> *noWarningStringsByString = @{@1 : @1,
                                                                                                                          @2 : @2,
                                                                                                                          @3 : @3,
                                                                                                                          };
    
    NSLog(@"noWarningStrings: %@, noWarningStringsByString: %@",
          noWarningStrings,
          noWarningStringsByString);

Expected Results:
The compiler should warn about both assignments because the generic type of the literal doesn’t match the lvalue generic type.

Actual Results:
The compile emits no warnings.

Regression:

Notes:

Comments


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