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correct non-termination of expand_goal and expand_term

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This commit is contained in:
Mark Thom
2018-12-14 19:10:38 -07:00
parent e90669d159
commit 47a1cfaddc
1 changed files with 7 additions and 5 deletions
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12
src/prolog/instructions.rs
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@@ -914,12 +914,14 @@ impl PartialOrd<CodePtr> for CodePtr {
impl PartialOrd<LocalCodePtr> for LocalCodePtr {
fn partial_cmp(&self, other: &LocalCodePtr) -> Option<Ordering> {
match (self, other) {
(&LocalCodePtr::DirEntry(p1), &LocalCodePtr::DirEntry(p2)) =>
p1.partial_cmp(&p2),
(&LocalCodePtr::DirEntry(..), &LocalCodePtr::TopLevel(_, _)) =>
Some(Ordering::Less),
(&LocalCodePtr::TopLevel(_, p1), &LocalCodePtr::TopLevel(_, ref p2)) =>
(&LocalCodePtr::InSituDirEntry(p1), &LocalCodePtr::DirEntry(ref p2))
| (&LocalCodePtr::DirEntry(p1), &LocalCodePtr::DirEntry(ref p2))
| (&LocalCodePtr::UserTermExpansion(p1), &LocalCodePtr::UserTermExpansion(ref p2))
| (&LocalCodePtr::UserGoalExpansion(p1), &LocalCodePtr::UserGoalExpansion(ref p2))
| (&LocalCodePtr::TopLevel(_, p1), &LocalCodePtr::TopLevel(_, ref p2)) =>
p1.partial_cmp(p2),
(_, &LocalCodePtr::TopLevel(_, _)) =>
Some(Ordering::Less),
_ => Some(Ordering::Greater)
}
}