[LLVMbugs] [Bug 9360] New: false positive warning with NSFastEnumeration and Obj-C for..in loop

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9360

           Summary: false positive warning with NSFastEnumeration and
                    Obj-C for..in loop
           Product: new-bugs
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sean at rogue-research.com
                CC: llvmbugs at cs.uiuc.edu


In r126782 compiling this:

-----------------
#import <Cocoa/Cocoa.h>

int main (int argc, char *argv[])
{
    (void)argc; (void)argv;

    NSObject<NSFastEnumeration>* collection = nil;
    for (id thing in collection) { }

    return 0;
}
-----------------

reports:

test.m:8:2: warning: collection expression type 'NSObject<NSFastEnumeration> *'
may not respond to
      'countByEnumeratingWithState:objects:count:'
        for (id thing in collection) { }
        ^                ~~~~~~~~~~


That's gotta be a false positive because that's exactly the only method
declared by NSFastEnumeration.  gcc does not warn.

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