class RuboCop::Cop::Layout::SpaceBeforeComment

1 + 1 # this operation does …
# good
1 + 1# this operation does …
# bad
@example
same line.
This cop checks for missing space between a token and a comment on the

def autocorrect(range) 

def autocorrect(range)
  ->(corrector) { corrector.insert_before(range, ' ') }
end

def investigate(processed_source) 

def investigate(processed_source)
  processed_source.tokens.each_cons(2) do |token1, token2|
    next unless token2.comment?
    next unless token1.line == token2.line
    if token1.pos.end == token2.pos.begin
      add_offense(token2.pos, location: token2.pos)
    end
  end
end