1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/layout/homogeneous-aggr-transparent.rs b/tests/ui/layout/homogeneous-aggr-transparent.rs
new file mode 100644
index 000000000..9703d2bf2
--- /dev/null
+++ b/tests/ui/layout/homogeneous-aggr-transparent.rs
@@ -0,0 +1,44 @@
+#![feature(rustc_attrs)]
+#![feature(transparent_unions)]
+use std::marker::PhantomData;
+
+// Regression test for #115664. We want to ensure that `repr(transparent)` wrappers do not affect
+// the result of `homogeneous_aggregate`.
+
+type Tuple = (f32, f32, f32);
+
+struct Zst;
+
+#[repr(transparent)]
+struct Wrapper1<T>(T);
+#[repr(transparent)]
+struct Wrapper2<T>((), Zst, T);
+#[repr(transparent)]
+struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
+#[repr(transparent)]
+union WrapperUnion<T: Copy> {
+    nothing: (),
+    something: T,
+}
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test0 = Tuple;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test1 = Wrapper1<Tuple>;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test2 = Wrapper2<Tuple>;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test3 = Wrapper3<Tuple>;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test4 = WrapperUnion<Tuple>;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+fn main() {}