---

yaml
---
r: 226970
b: refs/heads/master
c: fda9b83
h: refs/heads/master
v: v3

Author: nikomatsakis

[refs]

@@ -1,5 +1,5 @@
 ---
-refs/heads/master: 213326cddd0fa470c347992f5b66e776a85864a7
+refs/heads/master: fda9b8396057426e86409fd75c69d896b05c372e
 refs/heads/snap-stage3: 1af31d4974e33027a68126fa5a5a3c2c6491824f
 refs/heads/try: b53c0f93eedcdedd4fd89bccc5a3a09d1c5cd23e
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105

trunk/src/librustc_typeck/check/regionck.rs

@@ -1549,10 +1549,13 @@ fn components_must_outlive<'a, 'tcx>(rcx: &Rcx<'a, 'tcx>,
             outlives::Component::EscapingProjection(subcomponents) => {
                 components_must_outlive(rcx, origin, subcomponents, region);
             }
-            outlives::Component::UnresolvedInferenceVariable(_) => {
+            outlives::Component::UnresolvedInferenceVariable(v) => {
                 // ignore this, we presume it will yield an error
                 // later, since if a type variable is not resolved by
                 // this point it never will be
+                rcx.tcx().sess.delay_span_bug(
+                    origin.span(),
+                    &format!("unresolved inference variable in outlives: {:?}", v));
             }
             outlives::Component::RFC1214(subcomponents) => {
                 let suborigin = infer::RFC1214Subregion(Rc::new(origin));