X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibrustc%2Fty%2Fsubst.rs;h=75ba1dd46ca2a8260f4390d720d06a1c63025f57;hb=413790186c65e782e2c0183e933686f7bf35e158;hp=72dfe581ba73586082b7848f030c4c190158448a;hpb=bf54251f907c0979f14e955e0b4f3760ccba5317;p=rust.git

diff --git a/src/librustc/ty/subst.rs b/src/librustc/ty/subst.rs
index 72dfe581ba7..75ba1dd46ca 100644
--- a/src/librustc/ty/subst.rs
+++ b/src/librustc/ty/subst.rs
@@ -479,21 +479,22 @@ fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
         // the specialized routine `ty::replace_late_regions()`.
         match *r {
             ty::ReEarlyBound(data) => {
-                let r = self.substs.get(data.index as usize).map(|k| k.unpack());
-                match r {
+                let rk = self.substs.get(data.index as usize).map(|k| k.unpack());
+                match rk {
                     Some(UnpackedKind::Lifetime(lt)) => {
                         self.shift_region_through_binders(lt)
                     }
                     _ => {
                         let span = self.span.unwrap_or(DUMMY_SP);
-                        span_bug!(
-                            span,
+                        let msg = format!(
                             "Region parameter out of range \
                              when substituting in region {} (root type={:?}) \
                              (index={})",
                             data.name,
                             self.root_ty,
                             data.index);
+                        self.tcx.sess.delay_span_bug(span, &msg);
+                        r
                     }
                 }
             }