Backout f2ba35e96d46: "Remove unused private function"

coroutines._coroutine_at_yield_from() is used! I just forgot to run tests :-(

1 files changed, 15 insertions, 0 deletions

diff --git a/trollius/coroutines.py b/trollius/coroutines.py
index 554ab2d..8f9b998 100644
--- a/trollius/coroutines.py
+++ b/trollius/coroutines.py
@@ -106,6 +106,21 @@ else:
             logger.error(fmt, self.value)
 
 
+def _coroutine_at_yield_from(coro):
+    """Test if the last instruction of a coroutine is "yield from".
+
+    Return False if the coroutine completed.
+    """
+    frame = coro.gi_frame
+    if frame is None:
+        return False
+    code = coro.gi_code
+    assert frame.f_lasti >= 0
+    offset = frame.f_lasti + 1
+    instr = code.co_code[offset]
+    return (instr == _YIELD_FROM)
+
+
 class CoroWrapper(object):
     # Wrapper for coroutine object in _DEBUG mode.