I'm wandering around trunk looking for slowness.

are constant distractions which I've meant forever to fix anyway, such
as the importing of collection.mutable._ (or any other package with lots
of reused names.) Why is this relevant to performance? Well,

  var x = new HashSet[Int]

What's that? What does 'x += 1' mean? These are questions we can all
live without.

There's almost nothing left which references HashSet or HashMap or Stack
or other ambiguous classes without a qualifier: I can finish trunk but
I can't keep it clean on my own. (Where should I be writing this stuff
down, I wonder.) No review.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala b/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
index c7cdad7c20..dbc8c106f3 100644
--- a/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
+++ b/src/compiler/scala/tools/nsc/backend/icode/BasicBlocks.scala
@@ -303,7 +303,7 @@ trait BasicBlocks {
     /** Close the block */
     def close {
       assert(!closed || ignore)
-      assert(instructionList.length > 0, "Empty block.")
+      assert(instructionList.nonEmpty, "Empty block.")
       closed = true
       setFlag(DIRTYSUCCS)
       instructionList = instructionList.reverse