Latest nightly not able to find `extern crate rustc_mir`.

[Lee-Janggun]

The latest nightly is not able to find the compiler crate rustc_mir for some reason.

Code:

#![feature(rustc_private)]

extern crate rustc_mir;

fn main() {
}

Toolchain:

[toolchain]
channel = "nightly"
components = [ "rustc-dev", "llvm-tools-preview" ]

Platform: x86_64 Linux.

The above code fails to compile with cargo build, resulting in the following error message.

error[E0463]: can't find crate for `rustc_mir`
 --> src/main.rs:3:1
  |
3 | extern crate rustc_mir;
  | ^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
  |
  = help: maybe you need to install the missing components with: `rustup component add rust-src rustc-dev llvm-tools-preview`

The code compiles fine with nightly-2021-08-30, and after doing a manual search, I can confirm that problem occurs from nightly-2021-09-09. nightly-2021-09-08 works fine.

I do not know if other rustc crates suffer from the same problem. I used the above minimal example during search for ease.

I came across this bug when I was trying to compile this test case locally.

[tmiasko]

The rustc_mir was split into smaller crates in #80522.

[Lee-Janggun]

Thank you very much for the quick reply!