Simplify lazy-while and lazy-until constructs
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@ -211,17 +211,17 @@ TUPLE: lazy-until cons quot ;
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C: <lazy-until> lazy-until
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: luntil ( list quot -- result )
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<lazy-until> ;
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over nil? [ drop ] [ <lazy-until> ] if ;
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M: lazy-until car ( lazy-until -- car )
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lazy-until-cons car ;
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M: lazy-until cdr ( lazy-until -- cdr )
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[ lazy-until-cons uncons ] keep lazy-until-quot
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rot over call [ 2drop nil ] [ luntil ] if ;
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[ lazy-until-cons uncons swap ] keep lazy-until-quot tuck call
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[ 2drop nil ] [ luntil ] if ;
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M: lazy-until nil? ( lazy-until -- bool )
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lazy-until-cons nil? ;
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drop f ;
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M: lazy-until list? ( lazy-until -- bool )
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drop t ;
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@ -231,19 +231,16 @@ TUPLE: lazy-while cons quot ;
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C: <lazy-while> lazy-while
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: lwhile ( list quot -- result )
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<lazy-while>
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;
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over nil? [ drop ] [ <lazy-while> ] if ;
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M: lazy-while car ( lazy-while -- car )
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lazy-while-cons car ;
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M: lazy-while cdr ( lazy-while -- cdr )
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dup lazy-while-cons cdr dup nil?
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[ 2drop nil ] [ swap lazy-while-quot lwhile ] if ;
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[ lazy-while-cons cdr ] keep lazy-while-quot lwhile ;
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M: lazy-while nil? ( lazy-while -- bool )
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dup lazy-while-cons nil?
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[ nip ] [ [ car ] keep lazy-while-quot call not ] if* ;
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[ car ] keep lazy-while-quot call not ;
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M: lazy-while list? ( lazy-while -- bool )
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drop t ;
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