strip_absboolSyntax.strip_abs : term -> term list * term
Iteratively breaks apart abstractions.
If M has the form \x1 ... xn.t then
strip_abs M returns ([x1,...,xn],t). Note
that
strip_abs(list_mk_abs([x1,...,xn],t))
will not return ([x1,...,xn],t) if t is an
abstraction.
Never fails.