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  1. or download this
    use strict;
use warnings;
...
foo();

__END__
  2. or download this
    
// gcc y.c
...
    free(s);
}
void main(void){ foo(); }
  3. or download this
    % a.out
'hello there'
my free called
  4. or download this
    // gcc x.c
#define _GNU_SOURCE
...
    free(s);
}
void main(void){ foo(); }