The rustfmt version we previously used formats things differently from
what the latest nightly rustfmt does. This causes issues for subtrees
that get formatted both in-tree and in their own repo. Updating the
rustfmt used in-tree solves those issues. Also bumped the bootstrap
compiler as the stage0 update command always updates both at the same
time.
Currently, we are working on the python removal task on bootstrap. Which means
we have to extract some data from the stage0 file using shell scripts. However,
parsing values from the stage0.json file is painful because shell scripts don't
have a built-in way to parse json files.
This change simplifies the stage0 file format to key-value pairs, which makes
it easily readable from any environment.
Signed-off-by: onur-ozkan <work@onurozkan.dev>
