File: before.doc

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\DOC before

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

\SYNOPSIS
Finds the difference between two lists.

\LIBRARY window

\DESCRIBE
{before l1 l2} is the list {l} such that {(l @ l1) = l2}.

\FAILURE
{before l1 l2} fails if {l1} is not a suffix of {l2}.

\EXAMPLE
{
   #before [2; 3] [1; 2; 3];;
   [1] : int list
}

\SEEALSO
prefix, suffix, after

\ENDDOC