ho_unique_error.m:011: In `call_ho'(di, uo):
ho_unique_error.m:011:   error: `multi' is not a valid determinism for a
ho_unique_error.m:011:   predicate that has I/O state arguments. The valid
ho_unique_error.m:011:   determinisms for such predicates are `det', `cc_multi'
ho_unique_error.m:011:   and `erroneous', since the I/O state can be neither
ho_unique_error.m:011:   duplicated nor destroyed.
ho_unique_error.m:016: In clause for `call_ho(di, uo)':
ho_unique_error.m:016:   in argument 3 (i.e. argument 2 of the called
ho_unique_error.m:016:   predicate) of higher-order predicate call:
ho_unique_error.m:016:   mode error: variable `STATE_VARIABLE_IO_0' has
ho_unique_error.m:016:   instantiatedness `mostly_unique',
ho_unique_error.m:016:   expected instantiatedness was `unique'.
ho_unique_error.m:016:   This kind of uniqueness mismatch is usually caused by
ho_unique_error.m:016:   doing input/output or some other kind of destructive
ho_unique_error.m:016:   update in a context where it can be backtracked over,
ho_unique_error.m:016:   such as the condition of an if-then-else.