REPL completion completely broken on dot continuation on 2.13

```
scala 2.13.0-M4> $intp
res0: scala.tools.nsc.interpreter.Repl = scala.tools.nsc.interpreter.IMain@716e431d

scala 2.13.0-M4> .repreporter
                      ^
                 error: value repreporter is not a member of scala.tools.nsc.interpreter.Repl

scala 2.13.0-M4> 
```