1 files changed, 135 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/match_overlapping_arm.rs b/src/tools/clippy/tests/ui/match_overlapping_arm.rs
new file mode 100644
index 000000000..2f85e6357
--- /dev/null
+++ b/src/tools/clippy/tests/ui/match_overlapping_arm.rs
@@ -0,0 +1,135 @@
+#![feature(exclusive_range_pattern)]
+#![feature(half_open_range_patterns)]
+#![warn(clippy::match_overlapping_arm)]
+#![allow(clippy::redundant_pattern_matching)]
+#![allow(clippy::if_same_then_else, clippy::equatable_if_let)]
+
+/// Tests for match_overlapping_arm
+
+fn overlapping() {
+    const FOO: u64 = 2;
+
+    match 42 {
+        0..=10 => println!("0..=10"),
+        0..=11 => println!("0..=11"),
+        _ => (),
+    }
+
+    match 42 {
+        0..=5 => println!("0..=5"),
+        6..=7 => println!("6..=7"),
+        FOO..=11 => println!("FOO..=11"),
+        _ => (),
+    }
+
+    match 42 {
+        2 => println!("2"),
+        0..=5 => println!("0..=5"),
+        _ => (),
+    }
+
+    match 42 {
+        2 => println!("2"),
+        0..=2 => println!("0..=2"),
+        _ => (),
+    }
+
+    match 42 {
+        0..=10 => println!("0..=10"),
+        11..=50 => println!("11..=50"),
+        _ => (),
+    }
+
+    match 42 {
+        2 => println!("2"),
+        0..2 => println!("0..2"),
+        _ => (),
+    }
+
+    match 42 {
+        0..10 => println!("0..10"),
+        10..50 => println!("10..50"),
+        _ => (),
+    }
+
+    match 42 {
+        0..11 => println!("0..11"),
+        0..=11 => println!("0..=11"),
+        _ => (),
+    }
+
+    match 42 {
+        5..7 => println!("5..7"),
+        0..10 => println!("0..10"),
+        _ => (),
+    }
+
+    match 42 {
+        5..10 => println!("5..10"),
+        0..=10 => println!("0..=10"),
+        _ => (),
+    }
+
+    match 42 {
+        0..14 => println!("0..14"),
+        5..10 => println!("5..10"),
+        _ => (),
+    }
+
+    match 42 {
+        5..14 => println!("5..14"),
+        0..=10 => println!("0..=10"),
+        _ => (),
+    }
+
+    match 42 {
+        0..7 => println!("0..7"),
+        0..=10 => println!("0..=10"),
+        _ => (),
+    }
+
+    match 42 {
+        3.. => println!("3.."),
+        0.. => println!("0.."),
+        _ => (),
+    }
+
+    match 42 {
+        ..=23 => println!("..=23"),
+        ..26 => println!("..26"),
+        _ => (),
+    }
+
+    // Issue #7816 - overlap after included range
+    match 42 {
+        5..=10 => (),
+        0..=20 => (),
+        21..=30 => (),
+        21..=40 => (),
+        _ => (),
+    }
+
+    // Issue #7829
+    match 0 {
+        -1..=1 => (),
+        -2..=2 => (),
+        _ => (),
+    }
+
+    // Only warn about the first if there are multiple overlaps
+    match 42u128 {
+        0..=0x0000_0000_0000_00ff => (),
+        0..=0x0000_0000_0000_ffff => (),
+        0..=0x0000_0000_ffff_ffff => (),
+        0..=0xffff_ffff_ffff_ffff => (),
+        _ => (),
+    }
+
+    if let None = Some(42) {
+        // nothing
+    } else if let None = Some(42) {
+        // another nothing :-)
+    }
+}
+
+fn main() {}