class RuboCop::Cop::Style::WhenThen

This cop checks for when; uses in case expressions.

def autocorrect(node) 

def autocorrect(node)
  ->(corrector) { corrector.replace(node.loc.begin, ' then') }
end

def on_when(node) 

def on_when(node)
  return unless node.loc.begin && node.loc.begin.is?(';')
  add_offense(node, :begin)
end