Subject: bug#17400: makefile mode wrong colors upon shell ':' command

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Sun, 04 May 2014 07:39:53 +0800

$ cat Makefile
z:
	x||: #why is line blue?
	x||l #OK
$ help :
:: :
    Null command.

    No effect; the command does nothing.

    Exit Status:
    Always succeeds.