Remove unnecessary "`" in error message E0307 (invalid self type).

Author: kennytm

src/librustc_typeck/check/wfcheck.rs

@@ -525,7 +525,7 @@ impl<'a, 'gcx> CheckTypeWellFormedVisitor<'a, 'gcx> {
             } else {
                 fcx.tcx.sess.diagnostic().mut_span_err(
                     span, &format!("invalid `self` type: {:?}", self_arg_ty))
-                .note(&format!("type must be `{:?}` or a type that dereferences to it`", self_ty))
+                .note(&format!("type must be `{:?}` or a type that dereferences to it", self_ty))
                 .help("consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`")
                 .code(DiagnosticId::Error("E0307".into()))
                 .emit();

src/test/ui/span/issue-27522.stderr

@@ -4,7 +4,7 @@ error[E0307]: invalid `self` type: &SomeType
 LL |     fn handler(self: &SomeType); //~ ERROR invalid `self` type
    |                      ^^^^^^^^^
    |
-   = note: type must be `Self` or a type that dereferences to it`
+   = note: type must be `Self` or a type that dereferences to it
    = help: consider changing to `self`, `&self`, `&mut self`, or `self: Box<Self>`
 
 error: aborting due to previous error