If I comment the first line of a multi-line command the editor highlights all the next ones with the blue color, but actually only the first is skipped by the interpreter. That is:
# a = b + c + d + e + f \ + g + h
will be all in blue, but the line
+ g + h
will throw an error.
There are several solution to fix this bug, but I take the best (and the simplest) one is just not to highlight the next lines.