fix test

Author: mikhail-m1

src/test/compile-fail/issue-25579.rs

@@ -18,11 +18,10 @@ enum Sexpression {
 
 fn causes_ice(mut l: &mut Sexpression) {
     loop { match l {
-        &mut Sexpression::Num(ref mut n) => {}, //[mir]~ ERROR (Mir) [E0384]
+        &mut Sexpression::Num(ref mut n) => {},
         &mut Sexpression::Cons(ref mut expr) => { //[ast]~ ERROR [E0499]
                                                   //[mir]~^ ERROR (Ast) [E0499]
                                                   //[mir]~| ERROR (Mir) [E0506]
-                                                  //[mir]~| ERROR (Mir) [E0384]
                                                   //[mir]~| ERROR (Mir) [E0499]
             l = &mut **expr; //[ast]~ ERROR [E0506]
                              //[mir]~^ ERROR (Ast) [E0506]