error[E0658]: use of unstable library feature 'asm': inline assembly is not stable enough for use and is subject to change
  --> $DIR/feature-gate-asm2.rs:5:26
   |
LL |         println!("{:?}", asm!(""));
   |                          ^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/29722
   = help: add `#![feature(asm)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.