beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrMixinOrNamedMixinApplicationPrelude(class)
    handleIdentifier(A, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, A)
      handleNoType(A)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
      endClassOrMixinOrExtensionBody(DeclarationKind.Class, 0, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration(extension)
  beginMetadataStar(extension)
  endMetadataStar(0)
  beginExtensionDeclarationPrelude(extension)
    handleNoTypeVariables(on)
    beginExtensionDeclaration(extension, E)
      handleIdentifier(A, typeReference)
      handleNoTypeArguments({)
      handleType(A, null)
      handleExtensionShowHide(null, 0, null, 0)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Extension, {)
      endClassOrMixinOrExtensionBody(DeclarationKind.Extension, 0, {, })
    endExtensionDeclaration(extension, type, on, null, null, })
  endTopLevelDeclaration()
endCompilationUnit(2, )