rishi/scryer-prolog
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throw exception when predicate not found

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This commit is contained in:
Mark Thom
2018-04-09 21:27:50 -06:00
parent fe481fedce
commit ed9cca0750
4 changed files with 20 additions and 199 deletions
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12
src/prolog/copier.rs
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@@ -12,9 +12,9 @@ pub trait CopierTarget
fn deref(&self, Addr) -> Addr;
fn stack(&mut self) -> &mut AndStack;
// duplicate_term(L1, L2) uses Cheney's algorithm to copy the term at
// L1 to L2. forwarding_terms is kept to restore the innards of L1
// after it's been copied to L2.
// duplicate_term(L1, L2) uses Cheney's algorithm to copy the term
// at L1 to L2. trail is kept to restore the innards of L1 after
// it's been copied to L2.
fn duplicate_term(&mut self, a: Addr) where Self: IndexMut<usize, Output=HeapCellValue>
{
let mut trail: Vec<(Ref, HeapCellValue)>= Vec::new();
@@ -31,13 +31,13 @@ pub trait CopierTarget
match a.clone() {
Addr::Lis(a) => {
self[scan] = HeapCellValue::Addr(Addr::Lis(self.threshold()));
let hcv = self[a].clone();
self.push(hcv);
let hcv = self[a+1].clone();
self.push(hcv);
scan += 1;
},
Addr::HeapCell(_) | Addr::StackCell(_, _) => {