trace_division: more support for multiline divisions

my2to3/fixes/fix_trace_division.py

@@ -38,6 +38,9 @@ class FixTraceDivision(lib2to3.fixer_base.BaseFix):
 
   def transform(self, node, results):
     lineno = node.get_lineno()
+    divisor = node.children[0].clone()
+    if node.prefix == divisor.prefix:
+      divisor.prefix = ''
     comma = lib2to3.fixer_util.Comma()
     comma.prefix = prefix=node.children[1].prefix
 
@@ -47,7 +50,7 @@ class FixTraceDivision(lib2to3.fixer_base.BaseFix):
             args=(
                 lib2to3.fixer_util.Number(self.ids[lineno]),
                 lib2to3.fixer_util.Comma(),
-                node.children[0].clone(),
+                divisor,
                 comma,
                 node.children[2].clone(),
             ),

my2to3/tests/testFixTraceDivision.py

@@ -34,6 +34,13 @@ class testFixTraceDivision(FixerTestCase):
   , y)"""
     self.check(b, a)
 
+  def test_multiline_division_2(self):
+    b = """foo = \
+  x / y"""
+    a = """foo = \
+  division_traced(0,x , y)"""
+    self.check(b, a)
+
 
 if __name__ == '__main__':
   unittest.main()