Marius Bakke <mbakke@fastmail.com> writes:

> Rust 1.20 fails a test on core-updates, possibly because of the new
> version of GNU Make (4.3).
>
> I suppose we can disable that test for the bootstrap builds as long as
> it works for the latest version of Rust.

Fixed by giving Rust an earlier version of GNU Make in commit
47cd0febe957b698cc2ae28978bdc3bc89e787f9.