1 files changed, 41 insertions, 0 deletions
diff --git a/tests/ui/consts/const-compare-bytes-ub.rs b/tests/ui/consts/const-compare-bytes-ub.rs
new file mode 100644
index 000000000..2b4062fd2
--- /dev/null
+++ b/tests/ui/consts/const-compare-bytes-ub.rs
@@ -0,0 +1,41 @@
+// check-fail
+
+#![feature(core_intrinsics)]
+#![feature(const_intrinsic_compare_bytes)]
+use std::intrinsics::compare_bytes;
+use std::mem::MaybeUninit;
+
+fn main() {
+    const LHS_NULL: i32 = unsafe {
+        compare_bytes(0 as *const u8, 2 as *const u8, 0)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const RHS_NULL: i32 = unsafe {
+        compare_bytes(1 as *const u8, 0 as *const u8, 0)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const DANGLING_PTR_NON_ZERO_LENGTH: i32 = unsafe {
+        compare_bytes(1 as *const u8, 2 as *const u8, 1)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const LHS_OUT_OF_BOUNDS: i32 = unsafe {
+        compare_bytes([1, 2, 3].as_ptr(), [1, 2, 3, 4].as_ptr(), 4)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const RHS_OUT_OF_BOUNDS: i32 = unsafe {
+        compare_bytes([1, 2, 3, 4].as_ptr(), [1, 2, 3].as_ptr(), 4)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const LHS_UNINIT: i32 = unsafe {
+        compare_bytes(MaybeUninit::uninit().as_ptr(), [1].as_ptr(), 1)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const RHS_UNINIT: i32 = unsafe {
+        compare_bytes([1].as_ptr(), MaybeUninit::uninit().as_ptr(), 1)
+        //~^ ERROR evaluation of constant value failed
+    };
+    const WITH_PROVENANCE: i32 = unsafe {
+        compare_bytes([&1].as_ptr().cast(), [&2].as_ptr().cast(), std::mem::size_of::<usize>())
+        //~^ ERROR evaluation of constant value failed
+    };
+}