class RuboCop::Cop::Lint::Obscure

@example

# bad
if (a...b)

# bad
if (a..b)

ruby-doc.org/core-2.4.0/doc/syntax/control_expressions_rdoc.html#label-Flip-Flop

# bad
"%s" % "string"

ruby-doc.org/core-2.4.0/String.html#method-i-25