Add regression test for #11230

Fixes #11230

Author: odersky

tests/pos/i11230.scala

@@ -0,0 +1,6 @@
+trait TyperCrasher {
+  class CrashTyper(i: Int) {}
+  object CrashTyper {
+    def init: CrashTyper = CrashTyper(0)
+  }
+}