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Undefined values: Difference between revisions
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print_is_missing(123) # FALSE
</lang>
=={{header|Racket}}==
Racket does have an undefined value, which is used to initialize
recursive definitions. It can be grabbed explicitly with:
<lang Racket>
-> (letrec ([x x]) x)
#<undefined>
</lang>
However, it is not used as an implicit value for all (non-existent)
bindings. (Racket uses other meta-tools for that.)
=={{header|REXX}}==
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