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Add type variable table to InferenceTableSnapshot

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This commit is contained in:
Tianyi Song 2022-03-05 17:59:28 +08:00
parent 9d473a0b9f
commit c49bcc7814
1 changed files with 6 additions and 3 deletions
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9
crates/hir_ty/src/infer/unify.rs
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@ -140,7 +140,8 @@ pub(crate) struct InferenceTable<'a> {
pub(crate) struct InferenceTableSnapshot {
var_table_snapshot: chalk_solve::infer::InferenceSnapshot<Interner>,
// FIXME: snapshot type_variable_table, pending_obligations?
// FIXME: snapshot pending_obligations?
type_variable_table_snapshot: Vec<TypeVariableData>,
}
impl<'a> InferenceTable<'a> {
@ -356,12 +357,14 @@ impl<'a> InferenceTable<'a> {
}
pub(crate) fn snapshot(&mut self) -> InferenceTableSnapshot {
let snapshot = self.var_unification_table.snapshot();
InferenceTableSnapshot { var_table_snapshot: snapshot }
let var_table_snapshot = self.var_unification_table.snapshot();
let type_variable_table_snapshot = self.type_variable_table.clone();
InferenceTableSnapshot { var_table_snapshot, type_variable_table_snapshot }
}
pub(crate) fn rollback_to(&mut self, snapshot: InferenceTableSnapshot) {
self.var_unification_table.rollback_to(snapshot.var_table_snapshot);
self.type_variable_table = snapshot.type_variable_table_snapshot;
}
/// Checks an obligation without registering it. Useful mostly to check