Update error message for E0109

src/librustc/middle/astconv_util.rs

@@ -24,8 +24,10 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
     pub fn prohibit_type_params(self, segments: &[ast::PathSegment]) {
         for segment in segments {
             for typ in segment.parameters.types() {
-                span_err!(self.sess, typ.span, E0109,
-                          "type parameters are not allowed on this type");
+                struct_span_err!(self.sess, typ.span, E0109,
+                                 "type parameters are not allowed on this type")
+                    .span_label(typ.span, &format!("type parameter not allowed"))
+                    .emit();
                 break;
             }
             for lifetime in segment.parameters.lifetimes() {

src/test/compile-fail/E0109.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 type X = u32<i32>; //~ ERROR E0109
+                   //~| NOTE type parameter not allowed
 
 fn main() {
 }