Trunk not building? "implicit parameters may not be call-by-name" in ScalaSigPrinter

Posting here to put a signpost in Google...

I'm trying to build trunk @ r21198, and getting this:

> quick.scalap:
> [mkdir] Created dir:
> /home/acruise/dev/scala-trunk/build/quick/classes/scalap
> [scalacfork] Compiling 28 files to
> /home/acruise/dev/scala-trunk/build/quick/classes/scalap
> [scalacfork]
> /home/acruise/dev/scala-trunk/src/scalap/scala/tools/scalap/scalax/rules/scalasig/ScalaSigPrinter.scala:199:
> error: implicit parameters may not be call-by-name
> [scalacfork] def printMethodType(t: Type, printResult:
> Boolean)(implicit cont: => Unit): Unit = {
> [scalacfork]
> ^
> [scalacfork] one error found

Interestingly, the code in question appears to be nine months old;
presumably the rules have changed? Maybe a bootstrap bump needed?

Thanks!

-0xe1a