From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../homogeneous-aggr-zero-sized-repr-rust.rs       | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/test/ui/layout/homogeneous-aggr-zero-sized-repr-rust.rs

(limited to 'src/test/ui/layout/homogeneous-aggr-zero-sized-repr-rust.rs')

diff --git a/src/test/ui/layout/homogeneous-aggr-zero-sized-repr-rust.rs b/src/test/ui/layout/homogeneous-aggr-zero-sized-repr-rust.rs
new file mode 100644
index 000000000..a473c5c97
--- /dev/null
+++ b/src/test/ui/layout/homogeneous-aggr-zero-sized-repr-rust.rs
@@ -0,0 +1,72 @@
+#![feature(rustc_attrs)]
+
+// Regression test for #56877. We want to ensure that the presence of
+// `PhantomData` does not prevent `Bar` from being considered a
+// homogeneous aggregate.
+
+#[repr(C)]
+pub struct BaseCase {
+    pub a: f32,
+    pub b: f32,
+}
+
+#[repr(C)]
+pub struct WithPhantomData {
+    pub a: f32,
+    pub b: f32,
+    pub _unit: std::marker::PhantomData<()>,
+}
+
+pub struct EmptyRustStruct {}
+
+#[repr(C)]
+pub struct WithEmptyRustStruct {
+    pub a: f32,
+    pub b: f32,
+    pub _unit: EmptyRustStruct,
+}
+
+pub struct TransitivelyEmptyRustStruct {
+    field: EmptyRustStruct,
+    array: [u32; 0],
+}
+
+#[repr(C)]
+pub struct WithTransitivelyEmptyRustStruct {
+    pub a: f32,
+    pub b: f32,
+    pub _unit: TransitivelyEmptyRustStruct,
+}
+
+pub enum EmptyRustEnum {
+    Dummy,
+}
+
+#[repr(C)]
+pub struct WithEmptyRustEnum {
+    pub a: f32,
+    pub b: f32,
+    pub _unit: EmptyRustEnum,
+}
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test1 = BaseCase;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test2 = WithPhantomData;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test3 = WithEmptyRustStruct;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test4 = WithTransitivelyEmptyRustStruct;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type Test5 = WithEmptyRustEnum;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
+
+fn main() {}
-- 
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