Add 'use statements with extraneous spaces' tidy check

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.

- [X] ./mach test-tidy does not report any errors
- [X] These changes fix #14898 (github issue number if applicable).

1 files changed, 4 insertions, 0 deletions

diff --git a/python/tidy/servo_tidy/tidy.py b/python/tidy/servo_tidy/tidy.py
index 9b59b08e473..ae929d45c3c 100644
--- a/python/tidy/servo_tidy/tidy.py
+++ b/python/tidy/servo_tidy/tidy.py
@@ -612,6 +612,10 @@ def check_rust(file_name, lines):
             indent = len(original_line) - len(line)
             if not line.endswith(";") and '{' in line:
                 yield (idx + 1, "use statement spans multiple lines")
+            if '{ ' in line:
+                yield (idx + 1, "extra space after {")
+            if ' }' in line:
+                yield (idx + 1, "extra space before }")
             # strip "use" from the begin and ";" from the end
             current_use = line[4:-1]
             if prev_use: