Apologies if this is not a regression, or is intended.

I just tried to recompile one of our basic libs with 2.10-RC2 and hit a bizarre error. It seems to require a perfect storm of things to be the case (i.e. change package nestings, or exact classes and it disappears). The symptom of the problem is that compilation fails with the compiler reporting that some method does not exist. The method is added by implicit conversion and should be there. What is especially odd is that the compilation error disappears depending on the type of that which is to implicitly converted into.

The following is my attempt at a minimal example. Steps to reproduce

1. Create a project for scala. In package a.b.c create 3 files.

// C.scala
package a.b.c

trait C extends Conversions

object C extends C with d.Functions
```scala
{code:title=Conversions.scala}

package a.b.c

trait Conversions extends d.Conversions

object Conversions extends Conversions

// package.scala

package a.b

package object c extends C
```scal

4. Now create a sub-package d. In d, create 2 files

```scala
// Conversions.scala

package a.b.c.d

import language.implicitConversions

trait Conversions {
  import Conversions._
  implicit def str2todstring(s: String) = new StrLen(s)
}

object Conversions extends Conversions {
  class StrLen(s: String) {
    def strlen = s.length
  }
}

// Functions.scala
package a.b
package c
package d

trait Functions {

  import Conversions._
  val toStrLen = (_ : String).strlen
}

4. Now compile this using scalac 2.10.0-RC2 and a 1.6 JDK. You will get the compile error in a/b/c/d/Functions.scala:

error: value strlen is not a member of String
val toStrLen = (_ : String).strlen

5. Now remove the import language.implicitConversions line from a.b.c.d.Conversions.scala and recompile with 2.9.2. It compiles just fine

Please find attached the regression example in a ZIP file regression-minimal.zip.

Please use the files exactly as specified. The issue goes away if, for example, you change the package declarations in the files, or omit unnecessary imports.