--- /dev/null
+#![feature(core_intrinsics, rustc_attrs)]
+
+use std::intrinsics::rustc_peek;
+
+#[rustc_mir(rustc_peek_liveness, stop_after_dataflow)]
+fn foo() -> Option<i32> {
+ let mut x = None;
+
+ // `x` is live here since it is used in the next statement...
+ rustc_peek(x);
+
+ dbg!(x);
+
+ // But not here, since it is overwritten below
+ rustc_peek(x); //~ ERROR rustc_peek: bit not set
+
+ x = Some(4);
+
+ x
+}
+
+fn main() {}
--- /dev/null
+error: rustc_peek: bit not set
+ --> $DIR/liveness-enum.rs:15:5
+ |
+LL | rustc_peek(x);
+ | ^^^^^^^^^^^^^
+
+error: stop_after_dataflow ended compilation
+
+error: aborting due to 2 previous errors
+