File: is_pair.doc

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\DOC is_pair

\TYPE {is_pair : (term -> bool)}

\SYNOPSIS
Tests a term to see if it is a pair.

\DESCRIBE
{is_pair "(t1,t2)"} returns {true}. If the term is not a pair the result is
{false}.

\FAILURE
Never fails.

\SEEALSO
mk_pair, dest_pair.

\ENDDOC