error: unknown lint: `clashing_extern_declarations` and others

[psumbera]

I'm trying to build latest Rust sources from github on Solaris. There are no Solaris bootstrap archives therefore I'm using for bootstrap Rust 1.45.0. But I'm getting thinks like:

Building stage0 std artifacts (sparcv9-sun-solaris -> sparcv9-sun-solaris)
   Compiling core v0.0.0 (/builds/psumbera/RUST/rust/src/libcore)
error: unknown lint: `clashing_extern_declarations`
   --> src/libcore/lib.rs:298:9
    |
298 | #[allow(clashing_extern_declarations)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D unknown-lints` implied by `-D warnings`

error: unknown lint: `clashing_extern_declarations`
   --> src/libcore/lib.rs:298:9
    |
298 | #[allow(clashing_extern_declarations)]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0658]: the `#[track_caller]` attribute is an experimental feature
  --> src/libcore/ops/index.rs:68:5
   |
68 |     #[track_caller]
   |     ^^^^^^^^^^^^^^^
   |
   = note: see issue #47809 <https://github.com/rust-lang/rust/issues/47809> for more information
   = help: add `#![feature(track_caller)]` to the crate attributes to enable

error[E0658]: the `#[track_caller]` attribute is an experimental feature
   --> src/libcore/ops/index.rs:170:5
    |
170 |     #[track_caller]
    |     ^^^^^^^^^^^^^^^
    |
    = note: see issue #47809 <https://github.com/rust-lang/rust/issues/47809> for more information
    = help: add `#![feature(track_caller)]` to the crate attributes to enable

Any idea what is wrong?

[tmiasko]

The current version of rustc used for bootstraping is 1.46.0, so those errors
would indicate that 1.45.0 doesn't have clashing_extern_declarations lint and
the track_caller feature is still unstable.

You could either try checking out rustc from before #74395 (at that point it
should be possible to bootstrap from 1.45.0), or try reverting some of changes
there.

[psumbera]

Thanks for explanation. So this is not real bug. Closing it.