# OK (standard)
-e ./editable[d,dev]

# OK (whitespace between extras; disallowed by pip)
-e ./editable[d, dev]

# OK
-e ./editable[d,dev] ; python_version >= "3.9" and os_name == "posix"

# OK (whitespace between extras; disallowed by pip)
-e ./editable[d, dev] ; python_version >= "3.9" and os_name == "posix"

# OK
-e ./editable ; python_version >= "3.9" and os_name == "posix"

# OK (unterminated)
-e ./editable[d
