File: dest_cons.doc

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\DOC dest_cons

\TYPE {dest_cons : (term -> (term # term))}

\SYNOPSIS
Breaks apart a `CONS pair' into head and tail.

\DESCRIBE
{dest_cons} is a term destructor for `CONS pairs'. When applied to a term
representing a nonempty list {"[t;t1;...;tn]"} (which is equivalent to {"CONS t
[t1;...;tn]"}), it returns the pair of terms {("t","[t1;...;tn]")}.

\FAILURE
Fails with {dest_cons} if the term is not a non-empty list.

\SEEALSO
mk_cons, is_cons, mk_list, dest_list, is_list.

\ENDDOC