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Answers http://stackoverflow.com/questions/10373318/mixing-in-a-trait-dynamically.

Compile as follows:
scalac Common_1.scala Macros_2.scala
scalac Common_1.scala Test_3.scala -cp <path to the result of the previous compilation>

Tested in 2.10.0-M3, will most likely not compile by the time 2.10.0 final is released, because we're actively rehashing the API. 
However the principles will remain the same in the final release, so the concept itself is okay.
upd. Code updated for 2.10.0-M7.
upd. Code updated for 2.10.0-RC1.

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myke rebuild-alt-compiler C:\Projects\Perf_Bad 
psi: filename = cmd.exe, arguments = /C ant build -buildfile build.xml, home = C:\Projects\Perf_Bad
Buildfile: C:\Projects\Perf_Bad\build.xml

init.jars.check:

init.jars:

init:
     [echo]        build time: 1 May 2012, 16:07:05

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myke rebuild-alt-compiler C:\Projects\Perf_Good 
psi: filename = cmd.exe, arguments = /C ant build -buildfile build.xml, home = C:\Projects\Perf_Good
Buildfile: C:\Projects\Perf_Good\build.xml

init.jars.check:

init.jars:

init:
     [echo]        build time: 1 May 2012, 16:09:44

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myke run-test C:\Projects\Perf_Bad\build.xml 
psi: filename = cmd.exe, arguments = /C ant -Djavac.args=-Dmyke.comments=macro_materializers_enabled quick.comp -buildfile build.xml, home = C:\Projects\Perf_Bad
Buildfile: C:\Projects\Perf_Bad\build.xml

init.jars.check:

init.jars:

init:
     [echo]        build time: 2 May 2012, 18:39:36

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myke run-test C:\Projects\Perf_Bad\src\compiler\scala\tools\nsc\typechecker\Implicits.scala 
psi: filename = cmd.exe, arguments = /C ant -Djavac.args=-Dmyke.comments=macro_materializers_disabled quick.comp -buildfile build.xml, home = C:\Projects\Perf_Bad
Buildfile: C:\Projects\Perf_Bad\build.xml

init.jars.check:

init.jars:

init:
     [echo]        build time: 2 May 2012, 18:42:39

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trait StuffBase {
  type Base

  type Foo <: Base
  val Foo: FooExtractor
  implicit val FooTag: ClassTag[Foo]

  abstract class FooExtractor {
    def apply(x: Int): Foo
    def unapply(foo: Foo): Option[Int]

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trait StuffBase {
  type Foo
  implicit val FooTag: ClassManifest[Foo]
}

object Stuff extends StuffBase {
  class Foo
  implicit val FooTag = classManifest[Foo]
}

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package scala.reflect.runtime

package object eval {
  implicit class PimpedExpr[T](expr: scala.reflect.api.JavaUniverse # Expr[T]) {
    def runtimeEval: T = {
      import scala.tools.reflect._
      val u0 = expr.mirror.universe
      val expr0 = expr.asInstanceOf[u0.Expr[T]]
      val factory = universe2ToolBoxFactory(expr0.mirror)(u0)
      val toolbox = factory.mkToolBox()

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myke run-all-tests C:\Projects\KeplerUnderRefactoring 
git: branch = topic/reflection, commit = 0ce5eeebeaf11dbd27e163c1da0121aad83fa14f
psi: filename = cmd.exe, arguments = /C ant -Dscalac.args="""""" build -buildfile build.xml, home = C:\Projects\KeplerUnderRefactoring
Buildfile: C:\Projects\KeplerUnderRefactoring\build.xml

init.jars.check:

init.jars:
     [echo] Updating bootstrap libs.  (To do this by hand, run ./pull-binary-libs.sh)

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  /** The class for all symbols */
  abstract class Symbol protected[Symbols] (initOwner: Symbol, initPos: Position, initName: Name)
          extends SymbolContextApiImpl
             with HasFlags
             with SymbolFlagLogic
             with SymbolCreator
             // with FlagVerifier   // DEBUG
             with Annotatable[Symbol] {

    if (initName.toString == "scala") {