->char-set[procedure] ->char-set x
[procedure] x->char-set x
SRFI-14: x may be a string, a list of characters
or a character set. Returns a character set.
Although SRFI-14 defines ->char-set, it is not
a standard R5RS Scheme identifier. Some implementations
(e.g. Scheme48) uses the name x->char-set
instead.
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