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is_abs : term -> bool
SYNOPSIS
Tests a term to see if it is an abstraction.
DESCRIPTION
is_abs `\var. t` returns true. If the term is not an abstraction the
result is false.
FAILURE CONDITIONS
Never fails.
EXAMPLE
# is_abs `\x. x + 1`;;
val it : bool = true
# is_abs `!x. x >= 0`;;
val it : bool = false