Added comment suggested by @mjp41 and fixed trailing space bug

Lib/test/test_using.py

@@ -166,7 +166,7 @@ def _():
             result = c.get().value.value
         if result != 200:
             self.fail()
-            
+
     def test_thread_creation(self):
         from threading import PyronaThread as T
 

Lib/using.py

@@ -1,4 +1,4 @@
-from contextlib import contextmanager
+efrom contextlib import contextmanager
 
 # This library defines a decorator "@using" that uses blocking semantics.
 # A function decorated by a @using will be called as a result of its
@@ -46,6 +46,9 @@ def decorator(func):
             return func()
     return decorator
 
+# TODO: this creates a normal Python thread and ensures that all its
+# arguments are moved to the new thread. Eventually we should revisit
+# this behaviour as we go multiple interpreters / multicore.
 def PyronaThread(group=None, target=None, name=None,
                  args=(), kwargs=None, *, daemon=None):
     # Only check when a program uses pyrona
@@ -96,5 +99,3 @@ def ok_move(o):
             if not (ok_share(v) or (ok_move(v) and rc(kwargs) == 3)):
                 raise RuntimeError("Thread was passed an object which was neither immutable, a cown, or a unique region")
             return Thread(group, target, name, kwargs, daemon)
-
-