rebase: make "successors" a set in _computeobsoletenotrebased()
There's no apparent reason for this variable to be a list and this
avoids converting it to a set when needed.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true