slice_patterns: remove gates in tests

src/test/ui/parser/match-vec-invalid.rs

@@ -3,8 +3,6 @@ fn main() {
     match a {
         [1, tail @ .., tail @ ..] => {},
         //~^ ERROR identifier `tail` is bound more than once in the same pattern
-        //~| ERROR subslice patterns are unstable
-        //~| ERROR subslice patterns are unstable
         //~| ERROR `..` can only be used once per slice pattern
         _ => ()
     }

src/test/ui/parser/match-vec-invalid.stderr

@@ -4,24 +4,6 @@ error[E0416]: identifier `tail` is bound more than once in the same pattern
 LL |         [1, tail @ .., tail @ ..] => {},
    |                        ^^^^ used in a pattern more than once
 
-error[E0658]: subslice patterns are unstable
-  --> $DIR/match-vec-invalid.rs:4:13
-   |
-LL |         [1, tail @ .., tail @ ..] => {},
-   |             ^^^^^^^^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/62254
-   = help: add `#![feature(slice_patterns)]` to the crate attributes to enable
-
-error[E0658]: subslice patterns are unstable
-  --> $DIR/match-vec-invalid.rs:4:24
-   |
-LL |         [1, tail @ .., tail @ ..] => {},
-   |                        ^^^^^^^^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/62254
-   = help: add `#![feature(slice_patterns)]` to the crate attributes to enable
-
 error: `..` can only be used once per slice pattern
   --> $DIR/match-vec-invalid.rs:4:31
    |
@@ -31,12 +13,12 @@ LL |         [1, tail @ .., tail @ ..] => {},
    |                    previously used here
 
 error[E0308]: mismatched types
-  --> $DIR/match-vec-invalid.rs:13:30
+  --> $DIR/match-vec-invalid.rs:11:30
    |
 LL | const RECOVERY_WITNESS: () = 0;
    |                              ^ expected `()`, found integer
 
-error: aborting due to 5 previous errors
+error: aborting due to 3 previous errors
 
-Some errors have detailed explanations: E0308, E0416, E0658.
+Some errors have detailed explanations: E0308, E0416.
 For more information about an error, try `rustc --explain E0308`.

src/test/ui/parser/pat-lt-bracket-6.rs

@@ -4,7 +4,6 @@ fn main() {
 
     let Test(&desc[..]) = x;
     //~^ ERROR: expected one of `)`, `,`, `@`, or `|`, found `[`
-    //~^^ ERROR subslice patterns are unstable
 }
 
 const RECOVERY_WITNESS: () = 0; //~ ERROR mismatched types

src/test/ui/parser/pat-lt-bracket-6.stderr

@@ -7,22 +7,12 @@ LL |     let Test(&desc[..]) = x;
    |                   expected one of `)`, `,`, `@`, or `|`
    |                   help: missing `,`
 
-error[E0658]: subslice patterns are unstable
-  --> $DIR/pat-lt-bracket-6.rs:5:20
-   |
-LL |     let Test(&desc[..]) = x;
-   |                    ^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/62254
-   = help: add `#![feature(slice_patterns)]` to the crate attributes to enable
-
 error[E0308]: mismatched types
-  --> $DIR/pat-lt-bracket-6.rs:10:30
+  --> $DIR/pat-lt-bracket-6.rs:9:30
    |
 LL | const RECOVERY_WITNESS: () = 0;
    |                              ^ expected `()`, found integer
 
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 
-Some errors have detailed explanations: E0308, E0658.
-For more information about an error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0308`.