Problems reported:

parser/nnbd/error_recovery/external_placement:5:7: The modifier 'external' should be before the modifier 'final'.
final external int i1;
      ^^^^^^^^

parser/nnbd/error_recovery/external_placement:6:5: The modifier 'external' should be before the modifier 'var'.
var external i2;
    ^^^^^^^^

parser/nnbd/error_recovery/external_placement:9:13: The modifier 'external' should be before the modifier 'covariant'.
  covariant external num i3;
            ^^^^^^^^

parser/nnbd/error_recovery/external_placement:10:9: The modifier 'external' should be before the modifier 'final'.
  final external int i4;
        ^^^^^^^^

parser/nnbd/error_recovery/external_placement:11:9: The modifier 'external' should be before the modifier 'final'.
  final external i5;
        ^^^^^^^^

parser/nnbd/error_recovery/external_placement:12:10: The modifier 'external' should be before the modifier 'static'.
  static external final i6;
         ^^^^^^^^

parser/nnbd/error_recovery/external_placement:13:16: The modifier 'external' should be before the modifier 'static'.
  static final external i7;
               ^^^^^^^^

parser/nnbd/error_recovery/external_placement:14:9: The modifier 'static' should be before the modifier 'final'.
  final static external i8;
        ^^^^^^

parser/nnbd/error_recovery/external_placement:14:16: The modifier 'external' should be before the modifier 'static'.
  final static external i8;
               ^^^^^^^^

beginCompilationUnit(final)
  beginMetadataStar(final)
  endMetadataStar(0)
  beginTopLevelMember(final)
    handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'final'., Try re-ordering the modifiers., {string: external, string2: final}], external, external)
    beginFields()
      handleIdentifier(int, typeReference)
      handleNoTypeArguments(i1)
      handleType(int, null)
      handleIdentifier(i1, topLevelVariableDeclaration)
      handleNoFieldInitializer(;)
    endTopLevelFields(external, null, null, null, final, 1, final, ;)
  endTopLevelDeclaration(var)
  beginMetadataStar(var)
  endMetadataStar(0)
  beginTopLevelMember(var)
    handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'var'., Try re-ordering the modifiers., {string: external, string2: var}], external, external)
    beginFields(;)
      handleNoType(external)
      handleIdentifier(i2, topLevelVariableDeclaration)
      handleNoFieldInitializer(;)
    endTopLevelFields(external, null, null, null, var, 1, var, ;)
  endTopLevelDeclaration(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrNamedMixinApplicationPrelude(class)
    handleIdentifier(C, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, C)
      handleNoType(C)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinBody(DeclarationKind.Class, {)
        beginMetadataStar(covariant)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'covariant'., Try re-ordering the modifiers., {string: external, string2: covariant}], external, external)
        beginMember()
          beginFields({)
            handleIdentifier(num, typeReference)
            handleNoTypeArguments(i3)
            handleType(num, null)
            handleIdentifier(i3, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, null, covariant, null, null, 1, covariant, ;)
        endMember()
        beginMetadataStar(final)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'final'., Try re-ordering the modifiers., {string: external, string2: final}], external, external)
        beginMember()
          beginFields(;)
            handleIdentifier(int, typeReference)
            handleNoTypeArguments(i4)
            handleType(int, null)
            handleIdentifier(i4, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, null, null, null, final, 1, final, ;)
        endMember()
        beginMetadataStar(final)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'final'., Try re-ordering the modifiers., {string: external, string2: final}], external, external)
        beginMember()
          beginFields(;)
            handleNoType(external)
            handleIdentifier(i5, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, null, null, null, final, 1, final, ;)
        endMember()
        beginMetadataStar(static)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'static'., Try re-ordering the modifiers., {string: external, string2: static}], external, external)
        beginMember()
          beginFields(;)
            handleNoType(final)
            handleIdentifier(i6, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, static, null, null, final, 1, static, ;)
        endMember()
        beginMetadataStar(static)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'static'., Try re-ordering the modifiers., {string: external, string2: static}], external, external)
        beginMember()
          beginFields(;)
            handleNoType(external)
            handleIdentifier(i7, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, static, null, null, final, 1, static, ;)
        endMember()
        beginMetadataStar(final)
        endMetadataStar(0)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'static' should be before the modifier 'final'., Try re-ordering the modifiers., {string: static, string2: final}], static, static)
        handleRecoverableError(Message[ModifierOutOfOrder, The modifier 'external' should be before the modifier 'static'., Try re-ordering the modifiers., {string: external, string2: static}], external, external)
        beginMember()
          beginFields(;)
            handleNoType(external)
            handleIdentifier(i8, fieldDeclaration)
            handleNoFieldInitializer(;)
          endClassFields(null, external, static, null, null, final, 1, final, ;)
        endMember()
      endClassOrMixinBody(DeclarationKind.Class, 6, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration()
endCompilationUnit(3, )