Rollup merge of rust-lang#68842 - Centril:issue-68785, r=estebank

or_patterns: add regression test for rust-lang#68785

Fixes rust-lang#68785.

(Fixed by rust-lang#67668.)

cc rust-lang#54883
r? @estebank

src/test/ui/or-patterns/issue-68785-irrefutable-param-with-at.rs

@@ -0,0 +1,14 @@
+// check-pass
+
+#![feature(or_patterns)]
+
+enum MyEnum {
+    FirstCase(u8),
+    OtherCase(u16),
+}
+
+fn my_fn(x @ (MyEnum::FirstCase(_) | MyEnum::OtherCase(_)): MyEnum) {}
+
+fn main() {
+    my_fn(MyEnum::FirstCase(0));
+}