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\DOC insert
\TYPE {insert : 'a -> 'a list -> 'a list}
\SYNOPSIS
Adds element to the head of a list if not already present.
\DESCRIBE
The call {insert x l} returns just {l} if {x} is already in the list, and
otherwise returns {x::l}.
\EXAMPLE
{
# insert 5 (1--10);;
val it : int list = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10]
# insert 15 (1--10);;
val it : int list = [15; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10]
}
\USES
An analog to the basic list constructor {::} but treating the list more like a
set.
\SEEALSO
union, intersect, subtract.
\ENDDOC
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