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