1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/consts/issue-63952.rs b/src/test/ui/consts/issue-63952.rs
new file mode 100644
index 000000000..5c83e6f45
--- /dev/null
+++ b/src/test/ui/consts/issue-63952.rs
@@ -0,0 +1,27 @@
+// Regression test for #63952, shouldn't hang.
+// stderr-per-bitwidth
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct SliceRepr {
+    ptr: *const u8,
+    len: usize,
+}
+
+union SliceTransmute {
+    repr: SliceRepr,
+    slice: &'static [u8],
+}
+
+// bad slice: length too big to even exist anywhere
+const SLICE_WAY_TOO_LONG: &[u8] = unsafe { //~ ERROR: it is undefined behavior to use this value
+    SliceTransmute {
+        repr: SliceRepr {
+            ptr: &42,
+            len: usize::MAX,
+        },
+    }
+    .slice
+};
+
+fn main() {}