error[E0133]: call to unsafe function `f` is unsafe and requires unsafe function or block --> $DIR/unsafe-fn-used-as-value.rs:8:5 | LL | x(); | ^^^ call to unsafe function | = note: consult the function's documentation for information on how to avoid undefined behavior error: aborting due to previous error For more information about this error, try `rustc --explain E0133`.