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error[E0658]: use of unstable library feature `ipu_flatten`
--> $DIR/inference_unstable_forced.rs:11:20
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LL | assert_eq!('x'.ipu_flatten(), 0);
| ^^^^^^^^^^^
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= note: see issue #99999 <https://github.com/rust-lang/rust/issues/99999> for more information
= help: add `#![feature(ipu_flatten)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0658`.
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