Occurences of JavaNull in findMember by type

gistfile1.txt

➜  dotty git:(explicit-null-bootstrap) ✗ sort kk2 | uniq -c | sort -r
 136 >>> dotty.tools.dotc.reporting.diagnostic.ErrorMessageID | JavaNull
  87 >>> java.nio.file.Path | JavaNull
  80 >>> String | JavaNull
  51 >>> Object | JavaNull
  39 >>> org.jline.reader.LineReaderBuilder | JavaNull
  32 >>> ProfilingAsyncHelper.this.ThreadProfileData | JavaNull
  21 >>> scala.tools.asm.MethodVisitor | JavaNull
  15 >>> scala.tools.asm.Type | JavaNull
  14 >>> xsbti.api.Structure | JavaNull
  14 >>> scala.tools.asm.AnnotationVisitor | JavaNull
  14 >>> java.net.URI | JavaNull
  13 >>> xsbti.api.Type | JavaNull
  13 >>> java.io.InputStream | JavaNull
  12 >>> entries.E | JavaNull
  11 >>> ClassLoader | JavaNull
  10 >>> java.util.stream.Stream[java.nio.file.Path] | JavaNull
  10 >>> dotty.tools.dotc.core.TyperState | JavaNull
  10 >>> dotty.tools.dotc.ast.tpd.Select | JavaNull
  10 >>> T | JavaNull
   9 >>> scala.tools.asm.tree.InsnList | JavaNull
   9 >>> java.nio.file.FileSystem | JavaNull
   8 >>> scala.tools.asm.FieldVisitor | JavaNull
   8 >>> java.util.ListIterator[scala.tools.asm.tree.AbstractInsnNode] | JavaNull
   7 >>> java.util.jar.Attributes.Name | JavaNull
   7 >>> java.nio.file.attribute.FileTime | JavaNull
   7 >>> Throwable | JavaNull
   7 >>> GenBCodePipeline.this.Item2 | JavaNull
   7 >>> Array[xsbti.api.TypeParameter | JavaNull] | JavaNull
   6 >>> org.jline.terminal.TerminalBuilder | JavaNull
   6 >>> GenBCodePipeline.this.Item3 | JavaNull
   6 >>> Array[xsbti.api.ClassDefinition | JavaNull] | JavaNull
   6 >>> Array[xsbti.api.Annotation | JavaNull] | JavaNull
   5 >>> java.net.URL | JavaNull
   5 >>> dotty.tools.dotc.core.Types.Type | JavaNull
   5 >>> Iterable[java.nio.file.Path] | JavaNull
   5 >>> Array[Byte] | JavaNull
   4 ] | JavaNull
   4 >>> xsbti.api.TypeDeclaration | JavaNull
   4 >>> xsbti.api.TypeAlias | JavaNull
   4 >>> xsbti.api.Annotation | JavaNull
   4 >>> xsbti.api.Annotated | JavaNull
   4 >>> org.jline.reader.ParsedLine | JavaNull
   4 >>> java.nio.file.attribute.BasicFileAttributes | JavaNull
   4 >>> java.io.OutputStream | JavaNull
   4 >>> collection.mutable.ListBuffer[dotty.tools.dotc.core.Symbols.Symbol] | JavaNull
   4 >>> List[dotty.tools.dotc.typer.Implicits.Candidate] | JavaNull
   4 >>> Array[reflect.Method] | JavaNull
   3 >>> xsbti.api.Protected | JavaNull
   3 >>> xsbti.api.Private | JavaNull
   3 >>> xsbti.api.EmptyType | JavaNull
   3 >>> scala.tools.asm.tree.AbstractInsnNode | JavaNull
   3 >>> scala.tools.asm.Label | JavaNull
   3 >>> java.util.jar.Attributes | JavaNull
   3 >>> java.util.Map[String, java.util.jar.Attributes] | JavaNull
   3 >>> java.util.Base64.Encoder | JavaNull
   3 >>> java.util.Base64.Decoder | JavaNull
   3 >>> java.nio.file.DirectoryStream[java.nio.file.Path] | JavaNull
   3 >>> dotty.tools.dotc.core.SymDenotations.InheritedCache | JavaNull
   3 >>> Class[_] | JavaNull
   3 >>> Array[xsbti.api.Type | JavaNull] | JavaNull
   2 >>> xsbti.api.Var | JavaNull
   2 >>> xsbti.api.Val | JavaNull
   2 >>> xsbti.api.TypeParameter | JavaNull
   2 >>> xsbti.api.Singleton | JavaNull
   2 >>> xsbti.api.Qualifier | JavaNull
   2 >>> xsbti.api.Projection | JavaNull
   2 >>> xsbti.api.Polymorphic | JavaNull
   2 >>> xsbti.api.Path | JavaNull
   2 >>> xsbti.api.Parameterized | JavaNull
   2 >>> xsbti.api.ParameterRef | JavaNull
   2 >>> xsbti.api.ParameterList | JavaNull
   2 >>> xsbti.api.Lazy[T] | JavaNull
   2 >>> xsbti.api.Existential | JavaNull
   2 >>> xsbti.api.DefinitionType | JavaNull
   2 >>> xsbti.api.Def | JavaNull
   2 >>> xsbti.api.Constant | JavaNull
   2 >>> xsbti.api.ClassLikeDef | JavaNull
   2 >>> xsbti.UseScope | JavaNull
   2 >>> scala.tools.asm.util.Printer | JavaNull
   2 >>> scala.tools.asm.Handle | JavaNull
   2 >>> org.jline.utils.AttributedString | JavaNull
   2 >>> org.jline.terminal.Terminal | JavaNull
   2 >>> org.jline.reader.LineReader | JavaNull
   2 >>> java.util.jar.Manifest | JavaNull
   2 >>> java.util.function.Function[_ >: dotty.tools.dotc.core.Symbols.Symbol, _
   2 >>> java.util.function.BiConsumer[_ >: dotty.tools.dotc.core.Symbols.Symbol, _
   2 >>> java.util.List[scala.tools.asm.tree.FieldNode] | JavaNull
   2 >>> java.util.List[org.jline.reader.Candidate] | JavaNull
   2 >>> java.util.Iterator[java.nio.file.Path] | JavaNull
   2 >>> java.lang.management.MemoryUsage | JavaNull
   2 >>> Class[_ >: ?4.CAP] | JavaNull
   2 >>> Array[xsbti.api.ParameterList | JavaNull] | JavaNull
   2 >>> Array[xsbti.api.AnnotationArgument | JavaNull] | JavaNull
   2 >>> Array[java.io.File | JavaNull] | JavaNull
   2 >>> Array[String | JavaNull] | JavaNull
   2 >>> Array[Object | JavaNull] | JavaNull
   2 >>> Any | JavaNull
   2    >: CollectNullableFields.this.FieldInfo
   2    <: collection.mutable.ListBuffer[dotty.tools.dotc.core.Symbols.Symbol]
   1 [info] Packaging /Users/abeln/src/dotty2/dotty/library/../out/bootstrap/dotty-library-bootstrapped/scala-0.14/dotty-library_0.14-0.14.0-bin-SNAPSHOT.jar ...
   1 [info] Done packaging.
   1 [info] Done compiling.
   1 [info] Compiling 413 Scala sources and 3 Java sources to /Users/abeln/src/dotty2/dotty/compiler/../out/bootstrap/dotty-compiler-bootstrapped/scala-0.14/classes ...
   1 >>> xsbti.api.Variance | JavaNull
   1 >>> xsbti.api.Public | JavaNull
   1 >>> xsbti.api.ParameterModifier | JavaNull
   1 >>> xsbti.api.Modifiers | JavaNull
   1 >>> xsbti.api.ClassLike | JavaNull
   1 >>> xsbti.api.Access | JavaNull
   1 >>> java.util.function.Supplier[T] | JavaNull
   1 >>> java.util.function.IntFunction[Array[java.nio.file.Path & Object]] | JavaNull
   1 >>> java.util.function.Consumer[_ >: xsbti.UseScope] | JavaNull
   1 >>> java.util.List[scala.tools.asm.tree.MethodNode] | JavaNull
   1 >>> java.util.List[java.lang.management.GarbageCollectorMXBean] | JavaNull
   1 >>> java.util.List[String] | JavaNull
   1 >>> java.lang.management.RuntimeMXBean | JavaNull
   1 >>> java.lang.management.MemoryMXBean | JavaNull
   1 >>> java.lang.management.CompilationMXBean | JavaNull
   1 >>> java.lang.management.ClassLoadingMXBean | JavaNull
   1 >>> java.io.File | JavaNull
   1 >>> dotty.tools.dotc.profile.ExtendedThreadMxBean | JavaNull
   1 >>> GenBCodePipeline.this.Item1 | JavaNull
   1 >>> Class[?5.CAP] | JavaNull
   1 >>> Class[?3.CAP] | JavaNull
   1 >>> Class[?2.CAP] | JavaNull
   1 >>> Class[?1.CAP] | JavaNull
   1 >>> Array[xsbti.api.PathComponent | JavaNull] | JavaNull
   1 >>> Array[xsbti.api.MethodParameter | JavaNull] | JavaNull
   1 >>> A | JavaNull

All these would've failed to resolve without the JavaNull magic.