From bad80fe4ba4420bf58b7e11929ef40f458845037 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Thu, 22 Mar 2018 12:21:38 -0400
Subject: [PATCH] move the defaut object lifetime bound into the trait

This way, we don't have to repeat it.
---
 src/librustc/traits/engine.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/librustc/traits/engine.rs b/src/librustc/traits/engine.rs
index c2d7a0cdd288..8eee6f35ab95 100644
--- a/src/librustc/traits/engine.rs
+++ b/src/librustc/traits/engine.rs
@@ -15,7 +15,7 @@ use hir::def_id::DefId;
 use super::{FulfillmentContext, FulfillmentError};
 use super::{ObligationCause, PendingPredicateObligation, PredicateObligation};
 
-pub trait TraitEngine<'tcx> {
+pub trait TraitEngine<'tcx>: 'tcx {
     fn normalize_projection_type<'a, 'gcx>(
         &mut self,
         infcx: &InferCtxt<'a, 'gcx, 'tcx>,
@@ -52,7 +52,7 @@ pub trait TraitEngine<'tcx> {
     fn pending_obligations(&self) -> Vec<PendingPredicateObligation<'tcx>>;
 }
 
-impl<'a, 'gcx, 'tcx> TraitEngine<'tcx> + 'tcx {
+impl<'a, 'gcx, 'tcx> dyn TraitEngine<'tcx> {
     pub fn new(_tcx: TyCtxt<'_, '_, 'tcx>) -> Box<Self> {
         Box::new(FulfillmentContext::new())
     }