1 files changed, 63 insertions, 0 deletions
diff --git a/tests/ui/consts/const-eval/ub-int-array.rs b/tests/ui/consts/const-eval/ub-int-array.rs
new file mode 100644
index 000000000..a68d3fb17
--- /dev/null
+++ b/tests/ui/consts/const-eval/ub-int-array.rs
@@ -0,0 +1,63 @@
+// stderr-per-bitwidth
+//! Test the "array of int" fast path in validity checking, and in particular whether it
+//! points at the right array element.
+
+use std::mem;
+
+#[repr(C)]
+union MaybeUninit<T: Copy> {
+    uninit: (),
+    init: T,
+}
+
+const UNINIT_INT_0: [u32; 3] = unsafe {
+    [
+        MaybeUninit { uninit: () }.init,
+        //~^ ERROR evaluation of constant value failed
+        //~| uninitialized
+        1,
+        2,
+    ]
+};
+const UNINIT_INT_1: [u32; 3] = unsafe {
+    mem::transmute(
+        [
+            0u8,
+            0u8,
+            0u8,
+            0u8,
+            1u8,
+            MaybeUninit { uninit: () }.init,
+            //~^ ERROR evaluation of constant value failed
+            //~| uninitialized
+            1u8,
+            1u8,
+            2u8,
+            2u8,
+            MaybeUninit { uninit: () }.init,
+            2u8,
+        ]
+    )
+};
+const UNINIT_INT_2: [u32; 3] = unsafe {
+    mem::transmute(
+        [
+            0u8,
+            0u8,
+            0u8,
+            0u8,
+            1u8,
+            1u8,
+            1u8,
+            1u8,
+            2u8,
+            2u8,
+            2u8,
+            MaybeUninit { uninit: () }.init,
+            //~^ ERROR evaluation of constant value failed
+            //~| uninitialized
+        ]
+    )
+};
+
+fn main() {}