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$ gcc main.m -framework Foundation -framework MacRuby -fobjc-gc
$ ./a.out            
Fixnum
42

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

int main(void) {
  id ruby;

  ruby = [[MacRuby sharedRuntime] evaluateFileAtPath:@"test.rb"];

  NSNumber *num = [NSNumber numberWithInt: 42];
  [ruby performRubySelector:@selector(main:) withArguments: (id)num, NULL];
  return 0;
}

def main(num)
  p num.class
  puts num
end