➜  sandbox git:(opt/heuristics) ✗ cat Test.scala
class O {
  private object N extends Serializable
}

➜  sandbox git:(opt/heuristics) ✗ scalac Test.scala
➜  sandbox git:(opt/heuristics) ✗ asm *.class
➜  sandbox git:(opt/heuristics) ✗ mv *.asm a

➜  sandbox git:(opt/heuristics) ✗ ~/scala/scala2/build/quick/bin/scalac Test.scala
➜  sandbox git:(opt/heuristics) ✗ asm *.class
➜  sandbox git:(opt/heuristics) ✗ mv *.asm b

➜  sandbox git:(opt/heuristics) ✗ diff -r a b
diff -r a/O$N$.asm b/O$N$.asm
12,23d11
<   // access flags 0x1012
<   private final synthetic LO; $outer
<
<   // access flags 0x2
<   private readResolve()Ljava/lang/Object;
<     ALOAD 0
<     GETFIELD O$N$.$outer : LO;
<     INVOKEVIRTUAL O.O$$N ()LO$N$;
<     ARETURN
<     MAXSTACK = 1
<     MAXLOCALS = 1
<
26,34d13
<     ALOAD 1
<     IFNONNULL L0
<     ACONST_NULL
<     ATHROW
<    L0
<    FRAME SAME
<     ALOAD 0
<     ALOAD 1
<     PUTFIELD O$N$.$outer : LO;
38c17
<     MAXSTACK = 2
---
>     MAXSTACK = 1
diff -r a/O.asm b/O.asm
18c18
<   private O$$N$lzycompute()LO$N$;
---
>   private N$lzycompute()LO$N$;
54,55c54,55
<   // access flags 0x1
<   public O$$N()LO$N$;
---
>   // access flags 0x2
>   private N()LO$N$;
60c60
<     INVOKESPECIAL O.O$$N$lzycompute ()LO$N$;
---
>     INVOKESPECIAL O.N$lzycompute ()LO$N$;

class C {
  private object N extends Serializable
  def foo = N.toString
}

Test.scala:3: error: not found: value N
  def foo = N.toString
            ^
one error found