class RuboCop::Cop::Style::MethodCalledOnDoEndBlock

end.c
b
a do
@example
when reading code.
this check is that it’s easy to miss the call tacked on to the block
This cop checks for methods called on a do…end block. The point of

def on_block(node) 

def on_block(node)
  # If the method that is chained on the do...end block is itself a
  # method with a block, we allow it. It's pretty safe to assume that
  # these calls are not missed by anyone reading code. We also want to
  # avoid double reporting of offenses checked by the
  # MultilineBlockChain cop.
  ignore_node(node.send_node)
end

def on_send(node) 

def on_send(node)
  return if ignored_node?(node)
  receiver = node.receiver
  return unless receiver && receiver.block_type? &&
                receiver.loc.end.is?('end')
  range = range_between(receiver.loc.end.begin_pos,
                        node.source_range.end_pos)
  add_offense(nil, location: range)
end