Folks,
The 280_port of Lift properly compiles and runs the Lift demo application
against the Scala 2.8.0 nightly.
I spent most of today tracking down a bug that I can't reproduce in
isolation, but it seems that the ensureCapacity method in Scala's
StringBuilder method has an infinite:
def ensureCapacity(n: Int)
{117<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L117>
if (n > array.length)
{118<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L118>
var newsize = array.length *
2119<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L119>
while (n >
newsize)120<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L120>
newsize = newsize *
2121<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L121>
val newar = new
Array[Char](newsize)122<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L122>
arraycopy(array, 0, newar, 0,
count)123<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L123>
array =
newar124<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L124>
}125<http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/src/library/scala/collection/mutable/StringBuilder.scala?view=markup#L125>
}
I saw an infinite loop in lines 119/120 (it was line 115 in the version I
was testing against). I replaced Scala's StringBuilder with the Java native
code and all worked just fine. It might be worth a gander at the byte-code
for StringBuilder to see how an infinite loop could happen.
Anyway, I'm looking forward to the next drop of a stable 2.8.0 so I can
compile against Specs and get a more complete (read: passes tests... right
now the tests are commented out because I don't have the
Specs/ScalaCheck/etc. chain in the 2.8.0 nightly).
Thanks,
David
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
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