Update E0424 to the new error format

Fixes rust-lang#35797.

Signed-off-by: Johannes Löthberg <[email protected]>

Author: kyrias

src/librustc_resolve/lib.rs

@@ -344,11 +344,13 @@ fn resolve_struct_error<'b, 'a: 'b, 'c>(resolver: &'b Resolver<'a>,
                              path_name)
         }
         ResolutionError::SelfNotAvailableInStaticMethod => {
-            struct_span_err!(resolver.session,
+            let mut err = struct_span_err!(resolver.session,
                              span,
                              E0424,
-                             "`self` is not available in a static method. Maybe a `self` \
-                             argument is missing?")
+                             "`self` is not available in a static method");
+            err.span_label(span, &format!("not available in static method"));
+            err.note(&format!("maybe a `self` argument is missing?"));
+            err
         }
         ResolutionError::UnresolvedName { path, message: msg, context, is_static_method,
                                           is_field, def } => {

src/test/compile-fail/E0424.rs

@@ -14,7 +14,10 @@ impl Foo {
     fn bar(self) {}
 
     fn foo() {
-        self.bar(); //~ ERROR E0424
+        self.bar();
+        //~^ ERROR `self` is not available in a static method [E0424]
+        //~| NOTE not available in static method
+        //~| NOTE maybe a `self` argument is missing?
     }
 }
 

src/test/compile-fail/issue-2356.rs

@@ -59,7 +59,9 @@ impl cat {
 impl cat {
   fn meow() {
     if self.whiskers > 3 {
-        //~^ ERROR: `self` is not available in a static method. Maybe a `self` argument is missing?
+        //~^ ERROR `self` is not available in a static method [E0424]
+        //~| NOTE not available in static method
+        //~| NOTE maybe a `self` argument is missing?
         println!("MEOW");
     }
   }