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:- module constrained_poly_bound_arg.

:- interface.

:- type val_closure(X1)
    --->    val_closure(pred(X1)).

:- type closure_list(X2)
    --->    nil
    ;       list(X2, val_closure(closure_list(X2))).

:- inst val_closure(X3) == bound(error3.val_closure(pred(out(X3)) is det)).

:- inst closure_list(X4) == bound(error3.nil ;
    error3.list(X4, val_closure(closure_list(X4)))).

:- implementation.

:- pred eval(X5, X5).
:- mode eval(in(X6 =< ground), out(X6 =< ground)) is det.

eval(X, X).

:- pred m(closure_list(X8), closure_list(X8)).
:- mode m(in(closure_list(X9 =< ground)), out(closure_list(X9 =< ground)))
    is det.

m(CCL, RCL) :-
    eval(CCL, RCL).