Blows up on this perfectly reasonable Ruby code

[JoshCheek]

<<-"ab#{<<x}"
xyz
ab#{<<x}

Haven't explored it, maybe it thinks the last line is a comment?

[JoshCheek]

Issue is that this is double quoted, if you do it this way, it works:

<<-'ab#{<<x}'  # => "xyz\n"
xyz
ab#{<<x}