Imported From: https://issues.scala-lang.org/browse/SI-6879?orig=1
Reporter: @xeno-by
Affected Versions: 2.10.0
Blocks #7823

@xeno-by said (edited on Jan 22, 2014 3:54:34 PM UTC):
scala/scala#3401

Instead of per-compilation unit unique counters, the freshName API now
uses a per-Global counter. Fresh names now also contain dollars to exclude
clashes with supported user-defined names (the ones without dollar signs).

This doesn’t fix the bug, because per-Global counters get created anew
every time a new Global is instantiated, and that provides some potential
for name clashes even for def macros, but at least it completely excludes
clashes in typical situations.

Anyone have an opinion on whether this should stay open?

As a macro library author, I don't remember seeing any clashes. I don't think avoiding clashes between multiple Global instances is something we can / should reasonably support.