INTERNAL ERROR: Black produced code that is not equivalent to the source

[bersbersbers]

Describe the bug See title

To Reproduce

1. Take attached file.
2. Run Black on it without any argments
3. See error

Expected behavior Works

Environment (please complete the following information):

C:\Work\Desktop>black bug.py
error: cannot format bug.py: INTERNAL ERROR: Black produced code that is not equivalent to the source.  Please report a bug on https://github.com/psf/black/issues.  This diff might be helpful: C:\Users\bersbersbers\AppData\Local\Temp\blk_sow6kszn.log
Oh no! 💥 💔 💥
1 file failed to reformat.

Log:

--- src
+++ dst
@@ -13,17 +13,17 @@
             None,  # NoneType
         )  # /arguments
       body=
         Pass(
         )  # /Pass
+        Pass(
+        )  # /Pass
       decorator_list=
       name=
         'bug',  # str
       returns=
         None,  # NoneType
       type_comment=
         None,  # NoneType
     )  # /FunctionDef
-    Pass(
-    )  # /Pass
   type_ignores=
 )  # /Module

• Version: 19.10b0
• OS and Python version: Windows/Linux, 3.7.5

Does this bug also happen on master? Yes (note indentation of last pass)

bug.py.txt

[zsol]

This will be the same root cause as #569, let's keep the discussion there