Add tests

Author: Nadrieril

src/test/ui/pattern/usefulness/integer-ranges/overlapping_range_endpoints.rs

@@ -33,6 +33,12 @@ fn main() {
     m!(0u8, 25, 20..=30);
     m!(0u8, 30, 20..=30); //~ ERROR multiple patterns covering the same range
 
+    match 0u8 {
+        0..=10 => {}
+        20..=30 => {}
+        10..=20 => {} //~ ERROR multiple patterns covering the same range
+        _ => {}
+    }
     match (0u8, true) {
         (0..=10, true) => {}
         (10..20, true) => {} // not detected

src/test/ui/pattern/usefulness/integer-ranges/overlapping_range_endpoints.stderr

@@ -61,20 +61,30 @@ LL |     m!(0u8, 30, 20..=30);
    |             this range overlaps on `30_u8`
 
 error: multiple patterns covering the same range
-  --> $DIR/overlapping_range_endpoints.rs:44:16
+  --> $DIR/overlapping_range_endpoints.rs:39:9
+   |
+LL |         0..=10 => {}
+   |         ------ this range overlaps on `10_u8`
+LL |         20..=30 => {}
+   |         ------- this range overlaps on `20_u8`
+LL |         10..=20 => {}
+   |         ^^^^^^^ overlapping patterns
+
+error: multiple patterns covering the same range
+  --> $DIR/overlapping_range_endpoints.rs:50:16
    |
 LL |         (true, 0..=10) => {}
    |                ------ this range overlaps on `10_u8`
 LL |         (true, 10..20) => {}
    |                ^^^^^^ overlapping patterns
 
 error: multiple patterns covering the same range
-  --> $DIR/overlapping_range_endpoints.rs:50:14
+  --> $DIR/overlapping_range_endpoints.rs:56:14
    |
 LL |         Some(0..=10) => {}
    |              ------ this range overlaps on `10_u8`
 LL |         Some(10..20) => {}
    |              ^^^^^^ overlapping patterns
 
-error: aborting due to 9 previous errors
+error: aborting due to 10 previous errors