Problems reported:

parser/nnbd/issue_39858:2:8: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  late x1;
       ^^

parser/nnbd/issue_39858:3:15: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  static late x2;
              ^^

parser/nnbd/issue_39858:4:18: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  covariant late x3;
                 ^^

parser/nnbd/issue_39858:5:8: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  late x4 = 0;
       ^^

parser/nnbd/issue_39858:6:15: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  static late x5 = 0;
              ^^

parser/nnbd/issue_39858:7:18: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
  covariant late x6 = 0;
                 ^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrMixinOrNamedMixinApplicationPrelude(class)
    handleIdentifier(X, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, null, null, X)
      handleNoType(X)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinOrExtensionBody(DeclarationKind.Class, {)
        beginMetadataStar(late)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, null, null, late, null, {)
            handleRecoverableError(MissingConstFinalVarOrType, x1, x1)
            handleNoType(late)
            handleIdentifier(x1, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, null, null, null, null, late, null, 1, late, ;)
        endMember()
        beginMetadataStar(static)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, static, null, late, null, ;)
            handleRecoverableError(MissingConstFinalVarOrType, x2, x2)
            handleNoType(late)
            handleIdentifier(x2, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, null, null, static, null, late, null, 1, static, ;)
        endMember()
        beginMetadataStar(covariant)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, null, covariant, late, null, ;)
            handleRecoverableError(MissingConstFinalVarOrType, x3, x3)
            handleNoType(late)
            handleIdentifier(x3, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, null, null, null, covariant, late, null, 1, covariant, ;)
        endMember()
        beginMetadataStar(late)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, null, null, late, null, ;)
            handleRecoverableError(MissingConstFinalVarOrType, x4, x4)
            handleNoType(late)
            handleIdentifier(x4, fieldDeclaration)
            beginFieldInitializer(=)
              handleLiteralInt(0)
            endFieldInitializer(=, ;)
          endClassFields(null, null, null, null, null, late, null, 1, late, ;)
        endMember()
        beginMetadataStar(static)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, static, null, late, null, ;)
            handleRecoverableError(MissingConstFinalVarOrType, x5, x5)
            handleNoType(late)
            handleIdentifier(x5, fieldDeclaration)
            beginFieldInitializer(=)
              handleLiteralInt(0)
            endFieldInitializer(=, ;)
          endClassFields(null, null, null, static, null, late, null, 1, static, ;)
        endMember()
        beginMetadataStar(covariant)
        endMetadataStar(0)
        beginMember()
          beginFields(DeclarationKind.Class, null, null, null, null, covariant, late, null, ;)
            handleRecoverableError(MissingConstFinalVarOrType, x6, x6)
            handleNoType(late)
            handleIdentifier(x6, fieldDeclaration)
            beginFieldInitializer(=)
              handleLiteralInt(0)
            endFieldInitializer(=, ;)
          endClassFields(null, null, null, null, covariant, late, null, 1, covariant, ;)
        endMember()
      endClassOrMixinOrExtensionBody(DeclarationKind.Class, 6, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration()
endCompilationUnit(1, )