servo: Merge #7475 - Make test-tidy check that braces have spaces before or after them (from wilcus:checkBracesSpaces); r=jdm

https://github.com/servo/servo/issues/7413
Posible future/past bug fixed in components/script/timers.rs

Source-Repo: https://github.com/servo/servo
Source-Revision: 60c72f601c4dd7cfbc8a4a983099a4b323f1516a

servo/python/tidy.py

@@ -243,6 +243,16 @@ def check_rust(file_name, contents):
         if match:
             yield (idx + 1, "missing space before {")
 
+        # ignored cases like {} and }}
+        match = re.search(r"[^\s{}]}", line)
+        if match and not (line.startswith("use") or line.startswith("pub use")):
+            yield (idx + 1, "missing space before }")
+
+        # ignored cases like {} and {{
+        match = re.search(r"{[^\s{}]", line)
+        if match and not (line.startswith("use") or line.startswith("pub use")):
+            yield (idx + 1, "missing space after {")
+
         # imports must be in the same line and alphabetically sorted
         if line.startswith("use "):
             use = line[4:]