codeclimate/codeclimate-rubocop

This cop checks for extra underscores in variable assignment.

### Example:
    # bad
    a, b, _ = foo()
    a, b, _, = foo()
    a, _, _ = foo()
    a, _, _, = foo()

    # good
    a, b, = foo()
    a, = foo()
    *a, b, _ = foo()
    # => We need to know to not include 2 variables in a
    a, *b, _ = foo()
    # => The correction `a, *b, = foo()` is a syntax error

    # good if AllowNamedUnderscoreVariables is true
    a, b, _something = foo()