---

yaml
---
r: 194822
b: refs/heads/auto
c: 703308d
h: refs/heads/master
v: v3

Author: nikomatsakis

[refs]

@@ -10,7 +10,7 @@ refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/tags/release-0.3.1: 495bae036dfe5ec6ceafd3312b4dca48741e845b
 refs/tags/release-0.4: e828ea2080499553b97dfe33b3f4d472b4562ad7
 refs/tags/release-0.5: 7e3bcfbf21278251ee936ad53e92e9b719702d73
-refs/heads/auto: c59fe8bde2be55c46f627277e2cc37515fb7165e
+refs/heads/auto: 703308db4a130191db4000dfbbfc92936c604b52
 refs/heads/servo: af82457af293e2a842ba6b7759b70288da276167
 refs/tags/release-0.6: b4ebcfa1812664df5e142f0134a5faea3918544c
 refs/tags/0.1: b19db808c2793fe2976759b85a355c3ad8c8b336

branches/auto/src/librustc/middle/traits/fulfill.rs

@@ -164,6 +164,8 @@ impl<'tcx> FulfillmentContext<'tcx> {
         // debug output much nicer to read and so on.
         let obligation = infcx.resolve_type_vars_if_possible(&obligation);
 
+        assert!(!obligation.has_escaping_regions());
+
         if !self.duplicate_set.insert(obligation.predicate.clone()) {
             debug!("register_predicate({}) -- already seen, skip", obligation.repr(infcx.tcx));
             return;