Update compiler error 0030 to use new error format.

Author: silenuss

src/librustc_passes/consts.rs

@@ -283,10 +283,10 @@ impl<'a, 'tcx, 'v> Visitor<'v> for CheckCrateVisitor<'a, 'tcx> {
                     Ok(Ordering::Less) |
                     Ok(Ordering::Equal) => {}
                     Ok(Ordering::Greater) => {
-                        span_err!(self.tcx.sess,
-                                  start.span,
-                                  E0030,
-                                  "lower range bound must be less than or equal to upper");
+                        struct_span_err!(self.tcx.sess, start.span, E0030,
+                            "lower range bound must be less than or equal to upper")
+                            .span_label(start.span, &format!("lower bound larger than upper bound"))
+                            .emit();
                     }
                     Err(ErrorReported) => {}
                 }

src/test/compile-fail/E0030.rs

@@ -11,6 +11,8 @@
 
 fn main() {
     match 5u32 {
-        1000 ... 5 => {} //~ ERROR E0030
+        1000 ... 5 => {}
+        //~^ ERROR lower range bound must be less than or equal to upper
+        //~| NOTE lower bound larger than upper bound
     }
 }