Update uninhabited matches tests

Author: varkor

src/test/ui/uninhabited/uninhabited-matches-feature-gated.rs

@@ -20,10 +20,10 @@ fn main() {
     let _ = match x {}; //~ ERROR non-exhaustive
 
     let x: (Void,) = unsafe { std::mem::uninitialized() };
-    let _ = match x {}; //~ ERROR non-exhaustive
+    let _ = match x {}; // okay
 
     let x: [Void; 1] = unsafe { std::mem::uninitialized() };
-    let _ = match x {}; //~ ERROR non-exhaustive
+    let _ = match x {}; // okay
 
     let x: &[Void] = unsafe { std::mem::uninitialized() };
     let _ = match x {   //~ ERROR non-exhaustive

src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr

@@ -16,30 +16,6 @@ help: Please ensure that all possible cases are being handled; possibly adding w
 LL |     let _ = match x {}; //~ ERROR non-exhaustive
    |                   ^
 
-error[E0004]: non-exhaustive patterns: type (Void,) is non-empty
-  --> $DIR/uninhabited-matches-feature-gated.rs:23:19
-   |
-LL |     let _ = match x {}; //~ ERROR non-exhaustive
-   |                   ^
-   |
-help: Please ensure that all possible cases are being handled; possibly adding wildcards or more match arms.
-  --> $DIR/uninhabited-matches-feature-gated.rs:23:19
-   |
-LL |     let _ = match x {}; //~ ERROR non-exhaustive
-   |                   ^
-
-error[E0004]: non-exhaustive patterns: type [Void; 1] is non-empty
-  --> $DIR/uninhabited-matches-feature-gated.rs:26:19
-   |
-LL |     let _ = match x {}; //~ ERROR non-exhaustive
-   |                   ^
-   |
-help: Please ensure that all possible cases are being handled; possibly adding wildcards or more match arms.
-  --> $DIR/uninhabited-matches-feature-gated.rs:26:19
-   |
-LL |     let _ = match x {}; //~ ERROR non-exhaustive
-   |                   ^
-
 error[E0004]: non-exhaustive patterns: `&[_]` not covered
   --> $DIR/uninhabited-matches-feature-gated.rs:29:19
    |
@@ -58,7 +34,7 @@ error[E0005]: refutable pattern in local binding: `Err(_)` not covered
 LL |     let Ok(x) = x;
    |         ^^^^^ pattern `Err(_)` not covered
 
-error: aborting due to 7 previous errors
+error: aborting due to 5 previous errors
 
 Some errors occurred: E0004, E0005.
 For more information about an error, try `rustc --explain E0004`.