when scalar begins with newline. patches from Dave B <daz AT
d10.karoo.co.uk> at [ruby-core:23019] and caleb clausen at
[ruby-core:25851]. [ruby-core:23006][ruby-core:29925]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27591 b2dd03c8-39d4-4d8f-98ff-823fe69b080e