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( Forth testing harness
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"#" means "assert". We stop at first failure, indicating
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the failure through IO on port 1 )
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: fail SPC> ." failed" NL> 1 1 PC! BYE ;
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: # IF SPC> ." pass" NL> ELSE fail THEN ;
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: #eq 2DUP SWAP . SPC> '=' EMIT SPC> . '?' EMIT = # ;
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