rust/tests/ui/pin-macro/cant_access_internals.rs

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// edition:2018
use core::{
marker::PhantomPinned,
mem,
pin::{pin, Pin},
};
fn main() {
let mut phantom_pinned = pin!(PhantomPinned);
mem::take(phantom_pinned.pointer); //~ ERROR use of unstable library feature 'unsafe_pin_internals'
}