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      1 // RUN: %clang_cc1  -analyze -analyzer-checker=alpha.security.taint,debug.TaintTest %s -verify
      2 // expected-no-diagnostics
      3 
      4 #import <stdarg.h>
      5 
      6 @interface NSString
      7 - (NSString *)stringByAppendingString:(NSString *)aString;
      8 @end
      9 extern void NSLog (NSString *format, ...);
     10 extern void NSLogv(NSString *format, va_list args);
     11 
     12 void TestLog (NSString *format, ...);
     13 void TestLog (NSString *format, ...) {
     14     va_list ap;
     15     va_start(ap, format);
     16     NSString *string = @"AAA: ";
     17     
     18     NSLogv([string stringByAppendingString:format], ap);
     19     
     20     va_end(ap);
     21 }