Add 'use statements with extraneous spaces' tidy check
I added simple check routine for 'use statements with extraneous
spaces' and codes that breaks the check routine in rust_tidy.rs.
* Added a code that using 'use statements with extraneous spaces' code
in rust_tidy.rs
* Added assertion code in test_tidy.py.
* check_rust function in tidy.py now recognizes the simple case in
the 'use statements with extraneous spaces'.
* Ran tidy check on rust code and modified a
code(tests/unit/style/parsing/inherited_text.rs) that is not passing
on this new tidy check.
TODO: this code has to be refactored to support more general cases, such as tab or newline.
- [X] `./mach build -d` does not report any errors
- [X] ./mach test-tidy does not report any errors
- [X] These changes fix#14898 (github issue number if applicable).
- [X] These changes do not require tests because ./mach test-tidy itself is the test for the code.
Source-Repo: https://github.com/servo/servo
Source-Revision: b34fdf62341a01abb8da021f07071c5eb8b06622
af78352f0b