Xu Cheng 73b79de7bc ARGV: switch? should only has one dash
If user inputs argument such as `-with-flag`, we can assume it's a bad flag.

Closes Homebrew/homebrew#49256

Closes Homebrew/homebrew#49550.

Signed-off-by: Xu Cheng <xucheng@me.com>
2016-02-26 16:50:55 +08:00
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