Auto merge of #4562 - phansch:wildcard_enum_match_rustfix, r=llogiq

Add run-rustfix for wildcard_enum_match_arm lint

changelog: none

cc #3630

Author: bors

tests/ui/wildcard_enum_match_arm.fixed

@@ -0,0 +1,65 @@
+// run-rustfix
+
+#![deny(clippy::wildcard_enum_match_arm)]
+#![allow(unreachable_code, unused_variables)]
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+enum Color {
+    Red,
+    Green,
+    Blue,
+    Rgb(u8, u8, u8),
+    Cyan,
+}
+
+impl Color {
+    fn is_monochrome(self) -> bool {
+        match self {
+            Color::Red | Color::Green | Color::Blue => true,
+            Color::Rgb(r, g, b) => r | g == 0 || r | b == 0 || g | b == 0,
+            Color::Cyan => false,
+        }
+    }
+}
+
+fn main() {
+    let color = Color::Rgb(0, 0, 127);
+    match color {
+        Color::Red => println!("Red"),
+        Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan => eprintln!("Not red"),
+    };
+    match color {
+        Color::Red => println!("Red"),
+        _not_red @ Color::Green | _not_red @ Color::Blue | _not_red @ Color::Rgb(..) | _not_red @ Color::Cyan => eprintln!("Not red"),
+    };
+    let _str = match color {
+        Color::Red => "Red".to_owned(),
+        not_red @ Color::Green | not_red @ Color::Blue | not_red @ Color::Rgb(..) | not_red @ Color::Cyan => format!("{:?}", not_red),
+    };
+    match color {
+        Color::Red => {},
+        Color::Green => {},
+        Color::Blue => {},
+        Color::Cyan => {},
+        c if c.is_monochrome() => {},
+        Color::Rgb(_, _, _) => {},
+    };
+    let _str = match color {
+        Color::Red => "Red",
+        c @ Color::Green | c @ Color::Blue | c @ Color::Rgb(_, _, _) | c @ Color::Cyan => "Not red",
+    };
+    match color {
+        Color::Rgb(r, _, _) if r > 0 => "Some red",
+        Color::Red | Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan => "No red",
+    };
+    match color {
+        Color::Red | Color::Green | Color::Blue | Color::Cyan => {},
+        Color::Rgb(..) => {},
+    };
+    let x: u8 = unimplemented!();
+    match x {
+        0 => {},
+        140 => {},
+        _ => {},
+    };
+}

tests/ui/wildcard_enum_match_arm.rs

@@ -1,4 +1,7 @@
+// run-rustfix
+
 #![deny(clippy::wildcard_enum_match_arm)]
+#![allow(unreachable_code, unused_variables)]
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 enum Color {

tests/ui/wildcard_enum_match_arm.stderr

@@ -1,29 +1,29 @@
 error: wildcard match will miss any future added variants.
-  --> $DIR/wildcard_enum_match_arm.rs:26:9
+  --> $DIR/wildcard_enum_match_arm.rs:29:9
    |
 LL |         _ => eprintln!("Not red"),
    |         ^ help: try this: `Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`
    |
 note: lint level defined here
-  --> $DIR/wildcard_enum_match_arm.rs:1:9
+  --> $DIR/wildcard_enum_match_arm.rs:3:9
    |
 LL | #![deny(clippy::wildcard_enum_match_arm)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: wildcard match will miss any future added variants.
-  --> $DIR/wildcard_enum_match_arm.rs:30:9
+  --> $DIR/wildcard_enum_match_arm.rs:33:9
    |
 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 miss any future added variants.
-  --> $DIR/wildcard_enum_match_arm.rs:34:9
+  --> $DIR/wildcard_enum_match_arm.rs:37:9
    |
 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 miss any future added variants.
-  --> $DIR/wildcard_enum_match_arm.rs:50:9
+  --> $DIR/wildcard_enum_match_arm.rs:53:9
    |
 LL |         _ => "No red",
    |         ^ help: try this: `Color::Red | Color::Green | Color::Blue | Color::Rgb(..) | Color::Cyan`