Typer crashes when omitting new for instance generation

Using M3, the following code crashes the typer (not in vsc but in sbt on console):

```scala
class CrashTyper(i: Int) {}
object CrashTyper {
  def init: CrashTyper = CrashTyper(0) 
}
```
The following compiles:
```scala
class CrashTyper(i: Int) {}
object CrashTyper {
  def init: CrashTyper = new CrashTyper(0) 
}
```
sbt 1.4.6, linker plugin is 0.5.1
