rishi/scryer-prolog
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correct for issue #145

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This commit is contained in:
Mark Thom
2019-06-14 09:00:43 -04:00
parent 4fd70e9c6d
commit 39d5e6a2f9
5 changed files with 24 additions and 16 deletions
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16
src/prolog/machine/system_calls.rs
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@@ -275,9 +275,14 @@ impl MachineState {
},
None =>
match indices.code_dir.iter().next() {
Some(((ref name, arity), _)) => {
Some(((ref name, arity), idx)) => {
let a2 = self[temp_v!(2)].clone();
if idx.is_undefined() {
self.fail = true;
return;
}
if let Some(r) = a2.as_var() {
let spec = get_clause_spec(name.clone(), *arity,
composite_op!(&indices.op_dir));
@@ -296,9 +301,14 @@ impl MachineState {
let key = (name.clone(), arity);
match indices.code_dir.range(key ..).skip(1).next() {
Some(((name, arity), _)) => {
Some(((name, arity), idx)) => {
let a2 = self[temp_v!(2)].clone();
if idx.is_undefined() {
self.fail = true;
return;
}
if let Some(r) = a2.as_var() {
let spec = get_clause_spec(name.clone(), *arity,
composite_op!(&indices.op_dir));
@@ -990,8 +1000,6 @@ impl MachineState {
Addr::DBRef(db_ref) =>
match db_ref {
DBRef::Op(priority, spec, name, _, shared_op_desc) => {
let prec = self[temp_v!(2)].clone();
let specifier = self[temp_v!(3)].clone();
let op = self[temp_v!(4)].clone();