Don't use exact definition of std's ErrorKind in test.

Every time we add something to this enum in std, this test breaks.

tests/ui/auxiliary/non-exhaustive-enum.rs

@@ -0,0 +1,23 @@
+#[non_exhaustive]
+pub enum ErrorKind {
+    NotFound,
+    PermissionDenied,
+    ConnectionRefused,
+    ConnectionReset,
+    ConnectionAborted,
+    NotConnected,
+    AddrInUse,
+    AddrNotAvailable,
+    BrokenPipe,
+    AlreadyExists,
+    WouldBlock,
+    InvalidInput,
+    InvalidData,
+    TimedOut,
+    WriteZero,
+    Interrupted,
+    Other,
+    UnexpectedEof,
+    Unsupported,
+    OutOfMemory,
+}

tests/ui/wildcard_enum_match_arm.fixed

@@ -1,4 +1,5 @@
 // run-rustfix
+// aux-build:non-exhaustive-enum.rs
 
 #![deny(clippy::wildcard_enum_match_arm)]
 #![allow(
@@ -11,7 +12,9 @@
     clippy::diverging_sub_expression
 )]
 
-use std::io::ErrorKind;
+extern crate non_exhaustive_enum;
+
+use non_exhaustive_enum::ErrorKind;
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum Color {

tests/ui/wildcard_enum_match_arm.rs

@@ -1,4 +1,5 @@
 // run-rustfix
+// aux-build:non-exhaustive-enum.rs
 
 #![deny(clippy::wildcard_enum_match_arm)]
 #![allow(
@@ -11,7 +12,9 @@
     clippy::diverging_sub_expression
 )]
 
-use std::io::ErrorKind;
+extern crate non_exhaustive_enum;
+
+use non_exhaustive_enum::ErrorKind;
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum Color {

tests/ui/wildcard_enum_match_arm.stderr

@@ -1,35 +1,35 @@
 error: wildcard match will also match any future added variants
-  --> $DIR/wildcard_enum_match_arm.rs:39:9
+  --> $DIR/wildcard_enum_match_arm.rs:42:9
    |
 LL |         _ => eprintln!("Not red"),
    |         ^ help: try this: `Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`
    |
 note: the lint level is defined here
-  --> $DIR/wildcard_enum_match_arm.rs:3:9
+  --> $DIR/wildcard_enum_match_arm.rs:4:9
    |
 LL | #![deny(clippy::wildcard_enum_match_arm)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: wildcard match will also match any future added variants
-  --> $DIR/wildcard_enum_match_arm.rs:43:9
+  --> $DIR/wildcard_enum_match_arm.rs:46:9
    |
 LL |         _not_red => eprintln!("Not red"),
    |         ^^^^^^^^ help: try this: `_not_red @ Color::Green | _not_red @ Color::Blue | _not_red @ Color::Rgb(..) | _not_red @ Color::Cyan`
 
 error: wildcard match will also match any future added variants
-  --> $DIR/wildcard_enum_match_arm.rs:47:9
+  --> $DIR/wildcard_enum_match_arm.rs:50:9
    |
 LL |         not_red => format!("{:?}", not_red),
    |         ^^^^^^^ help: try this: `not_red @ Color::Green | not_red @ Color::Blue | not_red @ Color::Rgb(..) | not_red @ Color::Cyan`
 
 error: wildcard match will also match any future added variants
-  --> $DIR/wildcard_enum_match_arm.rs:63:9
+  --> $DIR/wildcard_enum_match_arm.rs:66:9
    |
 LL |         _ => "No red",
    |         ^ help: try this: `Color::Red | Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`
 
 error: wildcard matches known variants and will also match future added variants
-  --> $DIR/wildcard_enum_match_arm.rs:80:9
+  --> $DIR/wildcard_enum_match_arm.rs:83:9
    |
 LL |         _ => {},
    |         ^ help: try this: `ErrorKind::PermissionDenied | ErrorKind::ConnectionRefused | ErrorKind::ConnectionReset | ErrorKind::ConnectionAborted | ErrorKind::NotConnected | ErrorKind::AddrInUse | ErrorKind::AddrNotAvailable | ErrorKind::BrokenPipe | ErrorKind::AlreadyExists | ErrorKind::WouldBlock | ErrorKind::InvalidInput | ErrorKind::InvalidData | ErrorKind::TimedOut | ErrorKind::WriteZero | ErrorKind::Interrupted | ErrorKind::Other | ErrorKind::UnexpectedEof | ErrorKind::Unsupported | ErrorKind::OutOfMemory | _`