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-rw-r--r--src/librustc_parse/parser/ty.rs5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/librustc_parse/parser/ty.rs b/src/librustc_parse/parser/ty.rs
index 990661bf6b5..a573a1ee699 100644
--- a/src/librustc_parse/parser/ty.rs
+++ b/src/librustc_parse/parser/ty.rs
@@ -214,7 +214,10 @@ impl<'a> Parser<'a> {
                     let path = match bounds.remove(0) {
                         GenericBound::Trait(pt, ..) => pt.trait_ref.path,
                         GenericBound::Outlives(..) => {
-                            self.span_bug(ty.span, "unexpected lifetime bound")
+                            return Err(self.struct_span_err(
+                                ty.span,
+                                "expected trait bound, not lifetime bound",
+                            ));
                         }
                     };
                     self.parse_remaining_bounds(Vec::new(), path, lo, true)