1 files changed, 24 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-46855.rs b/src/test/ui/issues/issue-46855.rs
new file mode 100644
index 000000000..aa6378f85
--- /dev/null
+++ b/src/test/ui/issues/issue-46855.rs
@@ -0,0 +1,24 @@
+// run-pass
+#![allow(dead_code)]
+// compile-flags: -Zmir-opt-level=1
+
+use std::mem;
+
+#[derive(Copy, Clone)]
+enum Never {}
+
+union Foo {
+    a: u64,
+    b: Never
+}
+
+fn foo(xs: [(Never, u32); 1]) -> u32 { xs[0].1 }
+
+fn bar([(_, x)]: [(Never, u32); 1]) -> u32 { x }
+
+fn main() {
+    println!("{}", mem::size_of::<Foo>());
+
+    let f = [Foo { a: 42 }, Foo { a: 10 }];
+    println!("{:?}", unsafe { f[0].a });
+}