1 error[E0658]: use of unstable library feature 'ipu_flatten'
2 --> $DIR/inference_unstable_forced.rs:11:20
4 LL | assert_eq!('x'.ipu_flatten(), 0);
7 = note: see issue #99999 <https://github.com/rust-lang/rust/issues/99999> for more information
8 = help: add `#![feature(ipu_flatten)]` to the crate attributes to enable
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0658`.