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isspace : string -> bool

SYNOPSIS: Tests if a one-character string is some kind of space.
DESCRIPTION: The call isspace s tests whether the first character of string s (normally it is the only character) is a `space' of some kind, including tab and newline.
FAILURE CONDITIONS: Fails if the string is empty.
SEE ALSO: isalnum, isalpha, isbra, isnum, issep, issymb.