Simplify RegionConstraintCollector::vars_since_snapshot

2019-03-20 01:54:53 +00:00 · 2019-03-20 01:54:53 +00:00 · 2a08860ae6
commit 2a08860ae6
parent 92b2021b0a
1 changed files with 1 additions and 6 deletions
--- a/src/librustc/infer/region_constraints/mod.rs
+++ b/src/librustc/infer/region_constraints/mod.rs
@ -841,12 +841,7 @@ impl<'tcx> RegionConstraintCollector<'tcx> {
    }

    pub fn vars_since_snapshot(&self, mark: &RegionSnapshot) -> Vec<RegionVid> {
-        self.undo_log[mark.length..]
-            .iter()
-            .filter_map(|&elt| match elt {
-                AddVar(vid) => Some(vid),
-                _ => None,
-            }).collect()
+        self.unification_table.vars_since_snapshot(&mark.region_snapshot).collect()
    }

    /// See [`RegionInference::region_constraints_added_in_snapshot`].