From 50840ee851c7059e6261b2d961d5386e6763e963 Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Tue, 9 Jul 2019 13:49:20 +0200
Subject: [PATCH] Delay bug; this sidesteps ICE'ing when compiler is just doing
 error-recovery.

---
 .../infer/lexical_region_resolve/mod.rs       | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/src/librustc/infer/lexical_region_resolve/mod.rs b/src/librustc/infer/lexical_region_resolve/mod.rs
index d06c4434b3aa..4bfe953e45c0 100644
--- a/src/librustc/infer/lexical_region_resolve/mod.rs
+++ b/src/librustc/infer/lexical_region_resolve/mod.rs
@@ -764,16 +764,17 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
             }
         }
 
-        span_bug!(
+        // Errors in earlier passes can yield error variables without
+        // resolution errors here; delay ICE in favor of those errors.
+        self.tcx().sess.delay_span_bug(
             self.var_infos[node_idx].origin.span(),
-            "collect_error_for_expanding_node() could not find \
-             error for var {:?} in universe {:?}, lower_bounds={:#?}, \
-             upper_bounds={:#?}",
-            node_idx,
-            node_universe,
-            lower_bounds,
-            upper_bounds
-        );
+            &format!("collect_error_for_expanding_node() could not find \
+                      error for var {:?} in universe {:?}, lower_bounds={:#?}, \
+                      upper_bounds={:#?}",
+                     node_idx,
+                     node_universe,
+                     lower_bounds,
+                     upper_bounds));
     }
 
     fn collect_concrete_regions(