# fmt: off fails to stop formatting on a comment block

[fpdotmonkey]

Describe the bug

I have this file header in my source that I'd like to not mess with since it's got license information for code that isn't mine. So I wrap it in # fmt: off; ...; # fmt: on to preserve the block, but the block gets formatted anyway (a space gets added after the #).

Before black:

# fmt: off
#===- cindex-dump.py - cindex/Python Source Dump -------------*- python -*--===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===------------------------------------------------------------------------===#
# fmt: on

After black:

# fmt: off
# ===- cindex-dump.py - cindex/Python Source Dump -------------*- python -*--===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
# ===------------------------------------------------------------------------===#
# fmt: on

To Reproduce

1. Put the top code block in a file
2. Run Black on it
3. Code gets formatted

Expected behavior

Code doesn't get formatted

Environment (please complete the following information):

• Version: __main__.py, version 20.8b1
• OS and Python version: Ubuntu 18.04.5 LTS, Python 3.6.9

Does this bug also happen on main?

[ichard26]

Hey, thanks for reporting the bug! Unfortunately (or fortunately?) this is a duplicate of #1245 so I'll be closing this.