#![feature(rust_2018_preview)] is an error in the 2018 edition #50662
Description
This makes for relatively bad ergonomics, we should make this code a warning only on the 2018 edition (at most):
#![feature(rust_2018_preview)]
fn main() {
}compiled with:
$ rustc +nightly foo.rs --edition 2018
error[E0557]: feature has been removed
--> foo.rs:1:12
|
1 | #![feature(rust_2018_preview)]
| ^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0557`.