diff --git a/src/librustc_const_eval/pattern.rs b/src/librustc_const_eval/pattern.rs
index 0f8efa030ea..3cfa1d6797d 100644
--- a/src/librustc_const_eval/pattern.rs
+++ b/src/librustc_const_eval/pattern.rs
@@ -280,7 +280,8 @@ impl<'a, 'tcx> Pattern<'tcx> {
         let mut pcx = PatternContext::new(tcx, param_env_and_substs, tables);
         let result = pcx.lower_pattern(pat);
         if !pcx.errors.is_empty() {
-            debug!("encountered errors lowering pattern: {:?}", pcx.errors)
+            let msg = format!("encountered errors lowering pattern: {:?}", pcx.errors);
+            tcx.sess.delay_span_bug(pat.span, &msg);
         }
         debug!("Pattern::from_hir({:?}) = {:?}", pat, result);
         result