Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/test/ui/layout/homogeneous-aggr-zero-sized-c-struct.rs b/src/test/ui/layout/homogeneous-aggr-zero-sized-c-struct.rs
new file mode 100644
index 000000000..7eecd99dc
--- /dev/null
+++ b/src/test/ui/layout/homogeneous-aggr-zero-sized-c-struct.rs
@@ -0,0 +1,36 @@
+#![feature(rustc_attrs)]
+
+// Show that `homogeneous_aggregate` code ignores zero-length C
+// arrays.  This matches the recent C standard, though not the
+// behavior of all older compilers, which sometimes consider `T[0]` to
+// be a "flexible array member" (see discussion on #56877 for
+// details).
+
+#[repr(C)]
+pub struct Foo {
+    x: u32
+}
+
+#[repr(C)]
+pub struct Middle {
+    pub a: f32,
+    pub foo: [Foo; 0],
+    pub b: f32,
+}
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type TestMiddle = Middle;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous
+
+#[repr(C)]
+pub struct Final {
+    pub a: f32,
+    pub b: f32,
+    pub foo: [Foo; 0],
+}
+
+#[rustc_layout(homogeneous_aggregate)]
+pub type TestFinal = Final;
+//~^ ERROR homogeneous_aggregate: Ok(Homogeneous
+
+fn main() { }