isort 5.5.4 introduces syntax error by removing closing paren

[maxdjohnson]

Hello,

I've found what I believe to be a bug in isort. This is the minimum case I can find that reproduces the issue:

"""Foobar
    from {}""".format(
    "bar",
)

Saving this to a file t.py and running isort on it does the following for me

> isort t.py
Fixing /Users/mjohnson/t.py
> cat t.py
"""Foobar
    from {}""".format(
    "bar",

Note the missing closing paren from the last line, which is a syntax error. I have tested this on a fresh virtualenv with only isort==5.5.4 with both python 3.6 and 3.8.

[timothycrosley]

Thank you for reporting! this has been fixed in isort 5.5.5+ with several additional regression tests added.

~Timothy

[maxdjohnson]

Appreciate the quick fix!