1 files changed, 57 insertions, 0 deletions
diff --git a/tests/ui/pattern/usefulness/top-level-alternation.rs b/tests/ui/pattern/usefulness/top-level-alternation.rs
new file mode 100644
index 000000000..e8cd12ea4
--- /dev/null
+++ b/tests/ui/pattern/usefulness/top-level-alternation.rs
@@ -0,0 +1,57 @@
+#![deny(unreachable_patterns)]
+
+fn main() {
+    while let 0..=2 | 1 = 0 {} //~ ERROR unreachable pattern
+    if let 0..=2 | 1 = 0 {} //~ ERROR unreachable pattern
+
+    match 0u8 {
+        0
+            | 0 => {} //~ ERROR unreachable pattern
+        _ => {}
+    }
+    match Some(0u8) {
+        Some(0)
+            | Some(0) => {} //~ ERROR unreachable pattern
+        _ => {}
+    }
+    match (0u8, 0u8) {
+        (0, _) | (_, 0) => {}
+        (0, 0) => {} //~ ERROR unreachable pattern
+        (1, 1) => {}
+        _ => {}
+    }
+    match (0u8, 0u8) {
+        (0, 1) | (2, 3) => {}
+        (0, 3) => {}
+        (2, 1) => {}
+        _ => {}
+    }
+    match (0u8, 0u8) {
+        (_, 0) | (_, 1) => {}
+        _ => {}
+    }
+    match (0u8, 0u8) {
+        (0, _) | (1, _) => {}
+        _ => {}
+    }
+    match Some(0u8) {
+        None | Some(_) => {}
+        _ => {} //~ ERROR unreachable pattern
+    }
+    match Some(0u8) {
+        None | Some(_) => {}
+        Some(_) => {} //~ ERROR unreachable pattern
+        None => {} //~ ERROR unreachable pattern
+    }
+    match Some(0u8) {
+        Some(_) => {}
+        None => {}
+        None | Some(_) => {} //~ ERROR unreachable pattern
+    }
+    match 0u8 {
+        1 | 2 => {},
+        1..=2 => {}, //~ ERROR unreachable pattern
+        _ => {},
+    }
+    let (0 | 0) = 0 else { return }; //~ ERROR unreachable pattern
+}