1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/mir-opt/issue-72181.rs b/src/test/mir-opt/issue-72181.rs
new file mode 100644
index 000000000..844d53a4b
--- /dev/null
+++ b/src/test/mir-opt/issue-72181.rs
@@ -0,0 +1,28 @@
+// compile-flags: -Z mir-opt-level=1
+// Regression test for #72181, this ICE requires `-Z mir-opt-level=1` flags.
+
+use std::mem;
+
+#[derive(Copy, Clone)]
+enum Never {}
+
+union Foo {
+    a: u64,
+    b: Never
+}
+
+// EMIT_MIR_FOR_EACH_BIT_WIDTH
+// EMIT_MIR issue_72181.foo.mir_map.0.mir
+fn foo(xs: [(Never, u32); 1]) -> u32 { xs[0].1 }
+
+// EMIT_MIR issue_72181.bar.mir_map.0.mir
+fn bar([(_, x)]: [(Never, u32); 1]) -> u32 { x }
+
+// EMIT_MIR_FOR_EACH_BIT_WIDTH
+// EMIT_MIR issue_72181.main.mir_map.0.mir
+fn main() {
+    let _ = mem::size_of::<Foo>();
+
+    let f = [Foo { a: 42 }, Foo { a: 10 }];
+    let _ = unsafe { f[0].a };
+}