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 |t1, t2|
    next unless t2.comment?
    next unless t1.line == t2.line
    add_offense(t2.pos, location: t2.pos) if t1.pos.end == t2.pos.begin
  end
end