rustfmt.toml: don't ignore just any tests path, only root one Previously ignored any `tests` path, now only /tests at repo root. For reference, https://git-scm.com/docs/gitignore#_pattern_format
rustfmt.toml: don't ignore just any tests path, only root one Previously ignored any `tests` path, now only /tests at repo root. For reference, https://git-scm.com/docs/gitignore#_pattern_format