Moved test on E0493 from compile-fail to ui.

src/test/ui/span/E0493.rs

@@ -14,7 +14,6 @@ struct Foo {
 
 impl Drop for Foo {
     fn drop(&mut self) {}
-    //~^ NOTE destructor defined here
 }
 
 struct Bar {
@@ -26,8 +25,6 @@ impl Drop for Bar {
 }
 
 const F : Foo = Foo { a : 0 };
-//~^ ERROR constants are not allowed to have destructors [E0493]
-//~| NOTE constants cannot have destructors
 
 fn main() {
 }

src/test/ui/span/E0493.stderr

@@ -0,0 +1,11 @@
+error[E0493]: constants are not allowed to have destructors
+  --> $DIR/E0493.rs:27:17
+   |
+16 |     fn drop(&mut self) {}
+   |     --------------------- destructor defined here
+...
+27 | const F : Foo = Foo { a : 0 };
+   |                 ^^^^^^^^^^^^^ constants cannot have destructors
+
+error: aborting due to previous error
+