1 files changed, 60 insertions, 0 deletions
diff --git a/tests/ui/transmutability/arrays/should_inherit_alignment.rs b/tests/ui/transmutability/arrays/should_inherit_alignment.rs
new file mode 100644
index 00000000000..b00e5c7e400
--- /dev/null
+++ b/tests/ui/transmutability/arrays/should_inherit_alignment.rs
@@ -0,0 +1,60 @@
+// check-pass
+//! An array must inherit the alignment of its inner type.
+
+#![crate_type = "lib"]
+#![feature(transmutability)]
+#![allow(dead_code, incomplete_features, non_camel_case_types)]
+
+mod assert {
+    use std::mem::{Assume, BikeshedIntrinsicFrom};
+    pub struct Context;
+
+    pub fn is_maybe_transmutable<Src, Dst>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, {
+            Assume::ALIGNMENT
+                .and(Assume::LIFETIMES)
+                .and(Assume::SAFETY)
+                .and(Assume::VALIDITY)
+        }>
+    {}
+}
+
+#[derive(Clone, Copy)] #[repr(u8)] enum Ox00 { V = 0x00 }
+#[derive(Clone, Copy)] #[repr(u8)] enum Ox01 { V = 0x01 }
+#[derive(Clone, Copy)] #[repr(u8)] enum OxFF { V = 0xFF }
+
+#[repr(C)]
+union Uninit {
+    a: (),
+    b: OxFF,
+}
+
+#[repr(C, align(2))] struct align_2(Ox00);
+
+fn len_0() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 0], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}
+
+fn len_1() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 1], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox00, Uninit, Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}
+
+fn len_2() {
+    #[repr(C)] struct ImplicitlyPadded([align_2; 2], Ox01);
+    #[repr(C)] struct ExplicitlyPadded(Ox00, Uninit, Ox00, Uninit, Ox01, Uninit);
+
+    #[repr(C)] struct Struct();
+    assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
+    assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
+}