File: is_exists.doc

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\DOC is_exists

\TYPE {is_exists : term -> bool}

\SYNOPSIS
Tests a term to see if it as an existential quantification.

\DESCRIBE
{is_exists `?var. t`} returns {true}. If the term is not an existential
quantification the result is {false}.

\FAILURE
Never fails.

\SEEALSO
dest_exists, mk_exists.

\ENDDOC