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Snapshot obligations

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This commit is contained in:
Florian Diebold 2022-03-17 14:29:39 +01:00
parent 8f5b6ac556
commit 59b5696aaa
1 changed files with 8 additions and 2 deletions
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10
crates/hir_ty/src/infer/unify.rs
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@ -146,7 +146,7 @@ pub(crate) struct InferenceTable<'a> {
pub(crate) struct InferenceTableSnapshot {
var_table_snapshot: chalk_solve::infer::InferenceSnapshot<Interner>,
// FIXME: snapshot pending_obligations?
pending_obligations: Vec<Canonicalized<InEnvironment<Goal>>>,
type_variable_table_snapshot: Vec<TypeVariableData>,
}
@ -365,12 +365,18 @@ impl<'a> InferenceTable<'a> {
pub(crate) fn snapshot(&mut self) -> InferenceTableSnapshot {
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 }
let pending_obligations = self.pending_obligations.clone();
InferenceTableSnapshot {
var_table_snapshot,
pending_obligations,
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;
self.pending_obligations = snapshot.pending_obligations;
}
/// Checks an obligation without registering it. Useful mostly to check