Add test for multiple same arms lints

Changes:
- Add a test to match multiple arms in the same match statement

Author: Vincent Dal Maso

tests/ui/match_same_arms.rs

@@ -108,6 +108,14 @@ fn match_same_arms() {
         (None, Some(a)) => bar(a), // bindings have different types
         _ => (),
     }
+
+    let _ = match 42 {
+        42 => 1,
+        51 => 1, //~ ERROR match arms have same body
+        41 => 2,
+        52 => 2, //~ ERROR match arms have same body
+        _ => 0,
+    };
 }
 
 fn main() {}

tests/ui/match_same_arms.stderr

@@ -1,48 +1,10 @@
-error: this `match` has identical arm bodies
-  --> $DIR/match_same_arms.rs:37:14
-   |
-LL |           _ => {
-   |  ______________^
-LL | |             //~ ERROR match arms have same body
-LL | |             foo();
-LL | |             let mut a = 42 + [23].len() as i32;
-...  |
-LL | |             a
-LL | |         },
-   | |_________^
-   |
-   = note: `-D clippy::match-same-arms` implied by `-D warnings`
-note: same as this
-  --> $DIR/match_same_arms.rs:28:15
-   |
-LL |           42 => {
-   |  _______________^
-LL | |             foo();
-LL | |             let mut a = 42 + [23].len() as i32;
-LL | |             if true {
-...  |
-LL | |             a
-LL | |         },
-   | |_________^
-note: `42` has the same arm body as the `_` wildcard, consider removing it`
-  --> $DIR/match_same_arms.rs:28:15
-   |
-LL |           42 => {
-   |  _______________^
-LL | |             foo();
-LL | |             let mut a = 42 + [23].len() as i32;
-LL | |             if true {
-...  |
-LL | |             a
-LL | |         },
-   | |_________^
-
 error: this `match` has identical arm bodies
   --> $DIR/match_same_arms.rs:52:14
    |
 LL |         _ => 0, //~ ERROR match arms have same body
    |              ^
    |
+   = note: `-D clippy::match-same-arms` implied by `-D warnings`
 note: same as this
   --> $DIR/match_same_arms.rs:50:19
    |
@@ -139,5 +101,39 @@ note: consider refactoring into `(1, .., 3) | (.., 3)`
 LL |         (1, .., 3) => 42,
    |                       ^^
 
-error: aborting due to 7 previous errors
+error: this `match` has identical arm bodies
+  --> $DIR/match_same_arms.rs:114:15
+   |
+LL |         51 => 1, //~ ERROR match arms have same body
+   |               ^
+   |
+note: same as this
+  --> $DIR/match_same_arms.rs:113:15
+   |
+LL |         42 => 1,
+   |               ^
+note: consider refactoring into `42 | 51`
+  --> $DIR/match_same_arms.rs:113:15
+   |
+LL |         42 => 1,
+   |               ^
+
+error: this `match` has identical arm bodies
+  --> $DIR/match_same_arms.rs:116:15
+   |
+LL |         52 => 2, //~ ERROR match arms have same body
+   |               ^
+   |
+note: same as this
+  --> $DIR/match_same_arms.rs:115:15
+   |
+LL |         41 => 2,
+   |               ^
+note: consider refactoring into `41 | 52`
+  --> $DIR/match_same_arms.rs:115:15
+   |
+LL |         41 => 2,
+   |               ^
+
+error: aborting due to 8 previous errors