Add tests based on issue #70372 comments

src/test/ui/or-patterns/issue-70413-no-unreachable-pat-and-guard.rs

@@ -0,0 +1,22 @@
+// check-pass
+
+#![deny(unreachable_patterns)]
+
+#![feature(or_patterns)]
+fn main() {
+    match (3,42) {
+        (a,_) | (_,a) if a > 10 => {println!("{}", a)}
+        _ => ()
+    }
+
+    match Some((3,42)) {
+        Some((a, _)) | Some((_, a)) if a > 10 => {println!("{}", a)}
+        _ => ()
+
+    }
+
+    match Some((3,42)) {
+        Some((a, _) | (_, a)) if a > 10 => {println!("{}", a)}
+        _ => ()
+    }
+}