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nac3core/typecheck/unification_table: fixed snapshot restore bug

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Closes 229
This commit is contained in:
pca006132 2022-03-23 00:23:26 +08:00
parent 41d62f7325
commit d9be8d3978
1 changed files with 4 additions and 4 deletions
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8
nac3core/src/typecheck/unification_table.rs
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@ -61,7 +61,7 @@ impl<V> UnificationTable<V> {
if self.ranks[a] < self.ranks[b] { if self.ranks[a] < self.ranks[b] {
std::mem::swap(&mut a, &mut b); std::mem::swap(&mut a, &mut b);
} }
self.log.push(Action::Parent { key: b, original_parent: a }); self.log.push(Action::Parent { key: b, original_parent: self.parents[b] });
self.parents[b] = a; self.parents[b] = a;
if self.ranks[a] == self.ranks[b] { if self.ranks[a] == self.ranks[b] {
self.log.push(Action::Rank { key: a, original_rank: self.ranks[a] }); self.log.push(Action::Rank { key: a, original_rank: self.ranks[a] });
@ -106,7 +106,7 @@ impl<V> UnificationTable<V> {
// a = parent.parent // a = parent.parent
let a = self.parents[parent]; let a = self.parents[parent];
// root.parent = parent.parent // root.parent = parent.parent
self.log.push(Action::Parent { key: root, original_parent: a }); self.log.push(Action::Parent { key: root, original_parent: self.parents[root] });
self.parents[root] = a; self.parents[root] = a;
root = parent; root = parent;
// parent = root.parent // parent = root.parent
@ -145,8 +145,8 @@ impl<V> UnificationTable<V> {
pub fn discard_snapshot(&mut self, snapshot: (usize, u32)) { pub fn discard_snapshot(&mut self, snapshot: (usize, u32)) {
let (log_len, generation) = snapshot; let (log_len, generation) = snapshot;
assert!(self.log.len() >= log_len, "snapshot discard error"); assert!(self.log.len() >= log_len, "snapshot discard error");
assert!(matches!(self.log[log_len - 1], Action::Marker { generation: gen } if generation == gen), "snapshot discard error"); assert!(matches!(self.log[log_len - 1], Action::Marker { generation: gen } if gen == generation), "snapshot discard error");
self.log.truncate(log_len - 1); self.log.clear();
} }
} }