Sorting a literal drops a trailing comment, and raises if the comment contains "="

Sorting a literal rebuilds it from its parsed value, so anything written after the value on that line is not carried over. Two separate symptoms, both on main at 131f4adc and both independent of any open PR.

1. A trailing comment is silently deleted

>>> isort.code('__all__ = ["b", "a"]  # noqa: F401\n\nx = 1\n', sort_reexports=True)
'__all__ = ["a", "b"]\n\nx = 1\n'

The same happens through # isort: list, so it is the shared literal path rather than the reexport path:

>>> isort.code('# isort: list\n__all__ = ["b", "a"]  # exports\n\nx = 1\n')
'# isort: list\n__all__ = ["a", "b"]\n\nx = 1\n'

A dropped comment on __all__ is usually a directive, which makes this more than cosmetic:

The file still runs, and nothing is reported, so it surfaces later as a CI failure in an unrelated job.

2. A trailing comment containing = raises

>>> isort.code('# isort: list\n__all__ = ["b", "a"]  # pylint: disable=invalid-name\n\nx = 1\n')
ValueError: too many values to unpack (expected 2)

isort/literal.py:42 splits the whole section on every =:

variable_name, literal = code.split("=")

so a second = anywhere on the line, including inside a comment, breaks the unpack. # pylint: disable=..., # type: ignore[assignment] with a default, or a URL in a comment all reach it. code.split("=", 1) fixes this half.

Notes

Found while working on #2627, which fixes a different failure on the same seam (a statement or standalone comment following the literal). Both cases above are unchanged by that PR, in either direction, so this is a separate report rather than a review comment.

@Manny7717 offered to look at the trailing-comment case if it were filed.

Reproduced on main at 131f4adc, CPython 3.13.

AI-assisted: written with Claude Code, reproduced and tested by me before filing.

Start at isort/literal.py:42 and reproduce the two examples with isort.code(), including both sort_reexports=True and # isort: list. Trace the shared literal path and add regression coverage showing trailing comments are preserved and comments containing '=' do not raise; done means both examples retain their comments and produce sorted literals.