Fixed E0529's label and unit test

Author: Eugene R Gonzalez

src/librustc_typeck/check/_match.rs

@@ -270,7 +270,10 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                                     _ => {}
                                 }
                             }
-                            err.emit();
+
+                            err.span_label( pat.span,
+                                &format!("pattern cannot match with input type `{}`", expected_ty)
+                            ).emit();
                         }
                         (tcx.types.err, tcx.types.err)
                     }

src/test/compile-fail/E0529.rs

@@ -13,7 +13,9 @@
 fn main() {
     let r: f32 = 1.0;
     match r {
-        [a, b] => { //~ ERROR E0529
+        [a, b] => {
+        //~^ ERROR E0529
+        //~| NOTE pattern cannot match with input type `f32`
         }
     }
 }