File: exists.doc

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\DOC exists

\TYPE {exists : ((* -> bool) -> * list -> bool)}

\SYNOPSIS
Tests a list to see if it has at least one element satisfying a predicate.

\KEYWORDS
list.

\DESCRIBE
{exists p l} applies {p} to the elements of {l} in order until one is found
which satisfies {p}, or until the list is exhausted, returning {true} or
{false} accordingly.

\FAILURE
Never fails.

\SEEALSO
forall, find, tryfind, mem, assoc, rev_assoc.

\ENDDOC