| error[E0658]: use of unstable library feature '__rust_unstable_column': internal implementation detail of the `panic` macro | |
| --> $DIR/rust-unstable-column-gated.rs:2:20 | |
| | | |
| LL | println!("{}", __rust_unstable_column!()); | |
| | ^^^^^^^^^^^^^^^^^^^^^^ | |
| | | |
| = help: add `#![feature(__rust_unstable_column)]` to the crate attributes to enable | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0658`. |