fix typo in trait method mutability mismatch help

Author: euclio

compiler/rustc_typeck/src/check/compare_method.rs

@@ -296,7 +296,7 @@ fn compare_predicate_entailment<'tcx>(
                     {
                         diag.span_suggestion(
                             impl_err_span,
-                            "consider change the type to match the mutability in trait",
+                            "consider changing the mutability to match the trait",
                             trait_err_str,
                             Applicability::MachineApplicable,
                         );

src/test/ui/issues/issue-13033.stderr

@@ -5,14 +5,13 @@ LL |     fn bar(&mut self, other: &mut dyn Foo);
    |                              ------------ type in trait
 ...
 LL |     fn bar(&mut self, other: &dyn Foo) {}
-   |                              ^^^^^^^^ types differ in mutability
+   |                              ^^^^^^^^
+   |                              |
+   |                              types differ in mutability
+   |                              help: consider changing the mutability to match the trait: `&mut dyn Foo`
    |
    = note: expected fn pointer `fn(&mut Baz, &mut dyn Foo)`
               found fn pointer `fn(&mut Baz, &dyn Foo)`
-help: consider change the type to match the mutability in trait
-   |
-LL |     fn bar(&mut self, other: &mut dyn Foo) {}
-   |                              ^^^^^^^^^^^^
 
 error: aborting due to previous error
 

src/test/ui/mismatched_types/E0053.stderr

@@ -17,14 +17,13 @@ LL |     fn bar(&self);
    |            ----- type in trait
 ...
 LL |     fn bar(&mut self) { }
-   |            ^^^^^^^^^ types differ in mutability
+   |            ^^^^^^^^^
+   |            |
+   |            types differ in mutability
+   |            help: consider changing the mutability to match the trait: `&self`
    |
    = note: expected fn pointer `fn(&Bar)`
               found fn pointer `fn(&mut Bar)`
-help: consider change the type to match the mutability in trait
-   |
-LL |     fn bar(&self) { }
-   |            ^^^^^
 
 error: aborting due to 2 previous errors
 

src/test/ui/mismatched_types/trait-impl-fn-incompatibility.stderr

@@ -17,14 +17,13 @@ LL |     fn bar(&mut self, bar: &mut Bar);
    |                            -------- type in trait
 ...
 LL |     fn bar(&mut self, bar: &Bar) { }
-   |                            ^^^^ types differ in mutability
+   |                            ^^^^
+   |                            |
+   |                            types differ in mutability
+   |                            help: consider changing the mutability to match the trait: `&mut Bar`
    |
    = note: expected fn pointer `fn(&mut Bar, &mut Bar)`
               found fn pointer `fn(&mut Bar, &Bar)`
-help: consider change the type to match the mutability in trait
-   |
-LL |     fn bar(&mut self, bar: &mut Bar) { }
-   |                            ^^^^^^^^
 
 error: aborting due to 2 previous errors