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)
  method, _args, _body = *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 offences checked by the
  # MultilineBlockChain cop.
  ignore_node(method)
end

def on_send(node) 

def on_send(node)
  return if ignored_node?(node)
  receiver, _method_name, *_args = *node
  if receiver && receiver.type == :block && receiver.loc.end.is?('end')
    range = Parser::Source::Range.new(receiver.loc.end.source_buffer,
                                      receiver.loc.end.begin_pos,
                                      node.loc.expression.end_pos)
    convention(nil, range)
  end
end