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is_pair : term -> bool
SYNOPSIS
Tests a term to see if it is a pair.
DESCRIPTION
is_pair `(t1,t2)` returns true. If the term is not a pair the result is
false.
FAILURE CONDITIONS
Never fails.
EXAMPLE
# is_pair `1,2,3`;;
val it : bool = true
# is_pair `[1;2;3]`;;
val it : bool = false