anchor.diff:          "bin/XakeLibTests.dll" *> fun file -> action {
   
               // TODO --doc:..\bin\Xake.Core.XML --- multitarget rule!
  -            
  +
               let sources = fileset {
                   basedir "XakeLibTests"
                   includes "ActionTests.fs"
  
positive.code:         "bin/Xake.Core.dll" *> fun file -> action {
  
              // TODO --doc:..\bin\Xake.Core.XML --- multitarget rule!
              
              let sources = fileset {
                  basedir "core"
                  includes "Logging.fs"
  
negative.code:     let cmd',args' = if Xake.Env.isUnix then "mono", cmd::args else cmd,args
      in system cmd' args'
  
  do xake {ExecOptions.Default with Vars = ["NETFX", "mono-40"]; FileLog = "build.log"; ConLogLevel = Verbosity.Chatty } {
  
      rules [
          "all"  => action {
  