1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/consts/const-eval/double_check2.rs b/tests/ui/consts/const-eval/double_check2.rs
new file mode 100644
index 00000000000..81f5dde450b
--- /dev/null
+++ b/tests/ui/consts/const-eval/double_check2.rs
@@ -0,0 +1,32 @@
+// check-pass
+
+// This test exhibits undefined behavior, but it is very expensive and complex to check for such
+// UB in constants.
+// Thus, we do not detect it if you create references to statics in ways that are UB.
+
+enum Foo {
+    A = 5,
+    B = 42,
+}
+enum Bar {
+    C = 42,
+    D = 99,
+}
+#[repr(C)]
+union Union {
+    foo: &'static Foo,
+    bar: &'static Bar,
+    u8: &'static u8,
+}
+static BAR: u8 = 5;
+static FOO: (&Foo, &Bar) = unsafe {
+    (
+        // undefined behavior
+        Union { u8: &BAR }.foo,
+        Union { u8: &BAR }.bar,
+    )
+};
+static FOO2: (&Foo, &Bar) = unsafe { (std::mem::transmute(&BAR), std::mem::transmute(&BAR)) };
+//^ undefined behavior
+
+fn main() {}