Remove outdated test

Author: varkor

src/test/ui/match/match-unreachable-warning-with-diverging-discrim.rs

@@ -13,12 +13,6 @@
 #![allow(dead_code)]
 #![deny(unreachable_code)]
 
-fn a() {
-    // The match is considered unreachable here, because the `return`
-    // diverges:
-    match {return} { } //~ ERROR unreachable
-}
-
 fn b() {
     match () { () => return }
     println!("I am dead");

src/test/ui/match/match-unreachable-warning-with-diverging-discrim.stderr

@@ -1,30 +1,23 @@
-error: unreachable expression
-  --> $DIR/expr_match.rs:19:5
+error: unreachable statement
+  --> $DIR/expr_match.rs:18:5
    |
-LL |     match {return} { } //~ ERROR unreachable
-   |     ^^^^^^^^^^^^^^^^^^
+LL |     println!("I am dead");
+   |     ^^^^^^^^^^^^^^^^^^^^^^
    |
 note: lint level defined here
   --> $DIR/expr_match.rs:14:9
    |
 LL | #![deny(unreachable_code)]
    |         ^^^^^^^^^^^^^^^^
-
-error: unreachable statement
-  --> $DIR/expr_match.rs:24:5
-   |
-LL |     println!("I am dead");
-   |     ^^^^^^^^^^^^^^^^^^^^^^
-   |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
 error: unreachable statement
-  --> $DIR/expr_match.rs:35:5
+  --> $DIR/expr_match.rs:29:5
    |
 LL |     println!("I am dead");
    |     ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors