Without this, if it fails, the only information printed is useless:
Preparing a sysroot for Miri (target: x86_64-unknown-linux-gnu)...
fatal error: failed to build sysroot; run `cargo miri setup` to see the error details
GitHub's default timeout is 6 hours. Recently some of my GitHub Actions
jobs have started randomly stalling for that long, which is inconvenient
because it ties up a chunk of my runner quota. It apepars to be very
rare for a job to recover after stalling. It's better to time out
quicker and retry on a different runner.
Required by the transitive dev-dependency on once_cell.
error: failed to parse manifest at github.com-1ecc6299db9ec823/once_cell-1.15.0/Cargo.toml
Caused by:
feature `edition2021` is required
The package requires the Cargo feature called `edition2021`, but that feature is not stabilized in this version of Cargo (1.55.0 (32da73ab1 2021-08-23)).
Consider trying a newer version of Cargo (this may require the nightly release).
See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#edition-2021 for more information about the status of this feature.
The old version available by default in the GitHub Actions image fails
with:
thread 'main' panicked at 'package cache lock is not currently held, Cargo forgot to call `acquire_package_cache_lock` before we got to this stack frame', /usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/cargo-0.57.0/src/cargo/util/config/mod.rs:1542:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
David Tolnay