lint: add better rust formatting

[alexfertel]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 92.46436% with 37 lines in your changes missing coverage. Please review.

Project coverage is 93.4%. Comparing base (4966810) to head (9d481c9).

Additional details and impacted files

Files	Coverage Δ
src/check/rules/structural_match.rs	96.8% <100.0%> (+0.6%)	⬆️
src/check/utils.rs	94.4% <100.0%> (+1.1%)	⬆️
src/error.rs	100.0% <100.0%> (ø)
src/hir/combiner.rs	96.8% <100.0%> (+0.3%)	⬆️
src/hir/mod.rs	100.0% <100.0%> (ø)
src/scaffold/mod.rs	87.6% <100.0%> (+0.1%)	⬆️
src/sol/translator.rs	98.8% <100.0%> (+<0.1%)	⬆️
src/span.rs	45.0% <100.0%> (-9.2%)	⬇️
src/syntax/parser.rs	98.0% <100.0%> (+<0.1%)	⬆️
src/utils.rs	97.3% <100.0%> (+<0.1%)	⬆️
... and 10 more