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fix variable handling in Succ() #320

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merged 1 commit into from
Jun 13, 2024
Merged

fix variable handling in Succ() #320

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6 changes: 3 additions & 3 deletions engine/builtin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2817,9 +2817,9 @@ func nth(vm *VM, base Integer, n, list, elem Term, k Cont, env *Env) *Promise {

// Succ succeeds if s is the successor of non-negative integer x.
func Succ(vm *VM, x, s Term, k Cont, env *Env) *Promise {
switch x := x.(type) {
switch x := env.Resolve(x).(type) {
case Variable:
switch s := s.(type) {
switch s := env.Resolve(s).(type) {
case Variable:
return Error(InstantiationError(env))
case Integer:
Expand Down Expand Up @@ -2848,7 +2848,7 @@ func Succ(vm *VM, x, s Term, k Cont, env *Env) *Promise {
return Error(err)
}

switch s := s.(type) {
switch s := env.Resolve(s).(type) {
case Variable:
return Unify(vm, s, r, k, env)
case Integer:
Expand Down
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