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use constant ENABLE_DEBUG => 0;
sub debug { print $_[0]; }
debug 'test' if ENABLE_DEBUG;

use constant ('ENABLE_DEBUG', 0);
sub debug {
    print $_[0];
}
'???';

use constant ENABLE_DEBUG => 0;
sub debug { print $_[0] if ENABLE_DEBUG(); }
debug 'test';

use constant ('ENABLE_DEBUG', 0);
sub debug {
    0;
}
debug 'test';