Imported From: https://issues.scala-lang.org/browse/SI-4113?orig=1
Reporter: Ashish Belagali (ab)

@paulp said:
Recompile your code against 2.8.1.

Ashish Belagali (ab) said:
It still does not work against 2.8.1 while it works against 2.7.7.

$$ jar -tvf /home/ashish/prg/scala/lib/scala-library.jar | grep StringBuilder
70611 Tue Nov 09 14:47:18 IST 2010 scala/collection/mutable/StringBuilder.class

This makes me believe that the class was moved to another package. However, even after I import the class from its new location, the + function still seems to expect to find it in the scala package, and gives error.

Am I missing something here?

@ijuma said:
You are likely compiling with 2.7.7 even though you don't realise it. A lot of us have been using 2.8.1 for a while and we have code like you describe in a lot of places.

Ashish Belagali (ab) said:
Yes, it's truly surprising. I have a simple ant buildfile where I set scala.home to whichever version that I require, and the results are consistent from cmd line and from Eclipse; namely that it works correctly with 2.7.7 and it does not work with 2.8.1. (That rules out the possibility of accidentally using a different version.)

If I were incorrectly compiling with 2.7.7 as you say then I would not have come across the error in the first place.

As I had said before, the class is seen packaged in different folders in 2.8.1 version and in 2.7.7 version. Please consider the following:

$$ /home/ashish/prg/scala/bin/scala -version
Scala code runner version 2.8.1.final -- Copyright 2002-2010, LAMP/EPFL
$$ jar -tvf /home/ashish/prg/scala/lib/scala-library.jar | grep StringBuilder
70611 Tue Nov 09 14:47:18 IST 2010 scala/collection/mutable/StringBuilder.class

// The one below is 2.7.7 in Eclipse plugin
$$ jar -tvf /home/ashish/prg/eclipse/configuration/org.eclipse.osgi/bundles/590/1/.cp/lib/scala-library.jar | grep StringBuilder
932 Wed Oct 28 13:59:48 IST 2009 scala/StringBuilder$$$$anon$$1.class
3438 Wed Oct 28 13:59:44 IST 2009 scala/StringBuilder$$.class
15141 Wed Oct 28 13:59:50 IST 2009 scala/StringBuilder.class
21624 Wed Oct 28 13:59:42 IST 2009 scala/runtime/RichStringBuilder.class

Hope this helps.

@paulp said:
Look, you're compiling against something else. scala.StringBuilder is a type alias in 2.8.1. Somehow thousands of other projects use 2.8.1 just fine, and the error you're seeing points directly at the issue, which I already told you. Please don't reopen this ticket.