Update E0220 message to new format

Author: chamoysvoice

src/librustc_typeck/astconv.rs

@@ -1267,10 +1267,13 @@ impl<'o, 'gcx: 'tcx, 'tcx> AstConv<'gcx, 'tcx>+'o {
         -> Result<ty::PolyTraitRef<'tcx>, ErrorReported>
     {
         if bounds.is_empty() {
-            span_err!(self.tcx().sess, span, E0220,
-                      "associated type `{}` not found for `{}`",
-                      assoc_name,
-                      ty_param_name);
+            struct_span_err!(self.tcx().sess, span, E0220,
+                             "associated type `{}` not found for `{}`",
+                             assoc_name,
+                             ty_param_name)
+                .span_label(span, &format!("associated type `{}` not found",
+                            assoc_name))
+                .emit();
             return Err(ErrorReported);
         }
 

src/test/compile-fail/E0220.rs

@@ -13,6 +13,7 @@ trait Trait {
 }
 
 type Foo = Trait<F=i32>; //~ ERROR E0220
+                         //~| NOTE associated type `F` not found
                          //~^ ERROR E0191
 
 fn main() {