error[E0658]: panicking in constants is unstable
  --> $DIR/assert.rs:8:15
   |
LL | const _: () = assert!(true);
   |               ^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/51999
   = help: add `#![feature(const_panic)]` to the crate attributes to enable
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0658]: panicking in constants is unstable
  --> $DIR/assert.rs:12:15
   |
LL | const _: () = assert!(false);
   |               ^^^^^^^^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/51999
   = help: add `#![feature(const_panic)]` to the crate attributes to enable
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to 2 previous errors

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