Added missing backticks

Author: LeSeulArtichaut

src/librustc_typeck/check/op.rs

@@ -368,11 +368,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                                     Some("std::ops::BitOr"))
                                 },
                                 hir::BinOpKind::Shl    => {
-                                    (format!("no implementation for `{} << {}", lhs_ty, rhs_ty),
+                                    (format!("no implementation for `{} << {}`", lhs_ty, rhs_ty),
                                     Some("std::ops::Shl"))
                                 },
                                 hir::BinOpKind::Shr    => {
-                                    (format!("no implementation for `{} >> {}", lhs_ty, rhs_ty),
+                                    (format!("no implementation for `{} >> {}`", lhs_ty, rhs_ty),
                                     Some("std::ops::Shr"))
                                 },
                                 hir::BinOpKind::Eq |

src/test/ui/issues/issue-28837.stderr

@@ -68,7 +68,7 @@ LL |     a | a;
    |
    = note: an implementation of `std::ops::BitOr` might be missing for `A`
 
-error[E0369]: no implementation for `A << A
+error[E0369]: no implementation for `A << A`
   --> $DIR/issue-28837.rs:20:7
    |
 LL |     a << a;
@@ -78,7 +78,7 @@ LL |     a << a;
    |
    = note: an implementation of `std::ops::Shl` might be missing for `A`
 
-error[E0369]: no implementation for `A >> A
+error[E0369]: no implementation for `A >> A`
   --> $DIR/issue-28837.rs:22:7
    |
 LL |     a >> a;