So instead of using an implicitly moving tag ("nightly"), we've got an explicit nightly that we're using as of de714bef2376937c8cc9b524e36e47b0deff089b. This is much better for reproducibility and auditability, but calls for a robot's help in keeping that pin up to date.
It seems there was a moment when clippy forgot how to parse arguments ( https://github.com/rust-lang/rust-clippy/issues/9079 ), which unfortunately happens to be the version I had locally.
So instead of using an implicitly moving tag ("nightly"), we've got an explicit nightly that we're using as of de714bef2376937c8cc9b524e36e47b0deff089b. This is much better for reproducibility and auditability, but calls for a robot's help in keeping that pin up to date.