Objective C, playing with nil, #1.

playwithnil.m

#import <stdio.h>
#import <Foundation/Foundation.h>

@interface Foo : NSObject
- (void)foo;
@end

@implementation Foo
- (void) foo {
  printf("hello\n");
}
@end

int main( int argc, const char *argv[] ) {
    Foo * foo = nil; //[[Foo alloc] init];
    [foo foo]; // Does nothing. Duh.
    return 0;
}

Need the -lobjc argument to compile, btw.
$ gcc -lobjc <filename.m>