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Add ?dup
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core.fs
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core.fs
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@ -629,6 +629,10 @@ alias-builtin xor ^
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[compile] if
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; immediate
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\ ( n -- n n | n )
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\ duplicate if n<>0
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: ?dup dup if dup then ;
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\ === Loops ===
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\ begin <body> <condition> until
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\ begin <body> again
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