File: hd.doc

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\DOC hd

\TYPE {hd : (* list -> *)}

\SYNOPSIS
Computes the first element (the head) of a list.

\DESCRIBE
{hd [x1;...;xn]} returns {x1}.

\FAILURE
Fails with {hd} if the list is empty.

\SEEALSO
tl, el, null.

\ENDDOC