Several changes

Modify python/fix_error_messages.py
Add python/context_manager_return.py

Author: rec

python/context_manager_return.py

@@ -0,0 +1,19 @@
+from contextlib import contextmanager
+
+
+@contextmanager
+def c():
+    try:
+        yield
+    except ValueError:
+        pass
+
+
+def fail():
+    raise ValueError()
+
+
+with c():
+    a = fail()
+
+print('here')

python/fix_error_messages.py

@@ -14,6 +14,8 @@ def fix_error_messages():
         if m := MESSAGE_RE.search(line):
             file, message = m.groups()
             print(f"{file}: {message.strip()}")
+        elif not line:
+            break
         else:
             print(line.rstrip())