class RuboCop::Cop::Layout::SpaceBeforeComment

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

def on_new_investigation 

def on_new_investigation
  processed_source.sorted_tokens.each_cons(2) do |token1, token2|
    next unless token2.comment?
    next unless same_line?(token1, token2)
    next unless token1.pos.end == token2.pos.begin
    range = token2.pos
    add_offense(range) { |corrector| corrector.insert_before(range, ' ') }
  end
end