dest_pselect
pairSyntax.dest_pselect : term -> term * term
Breaks apart a paired choice-term into the selected pair and the body.
dest_pselect
is a term destructor for paired choice
terms. The application of dest_select
to
@pair. t
returns (pair,t)
.
Fails with dest_pselect
if term is not a paired
choice-term.