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#import <objc/objc.h>
#import <objc/Object.h>
#import <Foundation/Foundation.h>
 
@implementation TestObj
int main()
{
	NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 
	NSNumber num = @[NSNumber numberWithFloat: INFINITY];
 
	NSLog (@num.stringValue);
	[pool drain];
	return 0;
}
@end

prog.m:6:1: warning: cannot find interface declaration for ‘TestObj’
 int main()
 ^~~
prog.m: In function ‘main’:
prog.m:10:17: error: stray ‘@’ in program
  NSNumber num = @[NSNumber numberWithFloat: INFINITY];
                 ^
prog.m:10:18: error: invalid initializer
  NSNumber num = @[NSNumber numberWithFloat: INFINITY];
                  ^
prog.m:10:2: error: statically allocated instance of Objective-C class ‘NSNumber’
  NSNumber num = @[NSNumber numberWithFloat: INFINITY];
  ^~~~~~~~
prog.m:10:2: error: statically allocated instance of Objective-C class ‘NSNumber’
prog.m:12:9: error: stray ‘@’ in program
  NSLog (@num.stringValue);
         ^
prog.m:12:13: error: ‘struct NSNumber’ has no member named ‘stringValue’
  NSLog (@num.stringValue);
             ^
prog.m:10:11: warning: variable ‘num’ set but not used [-Wunused-but-set-variable]
  NSNumber num = @[NSNumber numberWithFloat: INFINITY];
           ^~~

Standard output is empty