1 // compile-flags: -Z unstable-options
3 #![feature(rustc_private)]
4 #![deny(rustc::potential_query_instability)]
6 extern crate rustc_data_structures;
8 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
11 let mut x = FxHashMap::<u32, i32>::default();
14 //~^ ERROR using `drain` can result in unstable
17 //~^ ERROR using `iter`
19 for _ in Some(&mut x).unwrap().iter_mut() {}
20 //~^ ERROR using `iter_mut`
23 //~^ ERROR using `into_iter`