Getting `Null check operator used on a null value` with a rather simple code.

[murat]

When I run the following code, I get this error Null check operator used on a null value (full stack trace is given below):

import 'package:dart_eval/dart_eval.dart';

void main() {
  const code = r'''void main() {
      const birthYear = 1990; // Туулган жылыңызды киргизиңиз
      const birthMonth = 1;   // Туулган айыңызды киргизиңиз. Мисалы, 8
      const birthDay = 23;    // Туулган күнүңүздү киргизиңиз. Мисалы, 14
      // 'final' менен бүгүнкү күндү белгилөө
      var today = DateTime.now();
      // 'final' менен туулган күндү DateTime'га айландыруу
      var birthDate = DateTime(birthYear, birthMonth, birthDay);
      // 'final' менен жашаган күндөрдүн санын эсептөө
      var daysLived = today.difference(birthDate).inDays;
      // Туулган күнүңүз жана бүгүнкү күнгө чейин жашаган күндөрүңүздү чыгаруу
      print("Сиздин туулган күнүңүз: $birthDate");
      print("Бүгүнкү күн: $today");
      print("Сиздин жашаган күндөрүңүздүн саны: $daysLived күн");
    }''';
  final compiler = Compiler();
  final runtime = compiler.compileWriteAndLoad({
    'example': {
      'main.dart': code,
    }
  });
  runtime.executeLib('package:example/main.dart', 'main');
}

Error stack trace:

Unhandled exception:
Null check operator used on a null value
#0      compileMethodInvocation (package:dart_eval/src/eval/compiler/expression/method_invocation.dart:121:34)
#1      compileExpression (package:dart_eval/src/eval/compiler/expression/expression.dart:38:12)
#2      compileVariableDeclarationList (package:dart_eval/src/eval/compiler/statement/variable_declaration.dart:33:17)
#3      compileVariableDeclarationStatement (package:dart_eval/src/eval/compiler/statement/variable_declaration.dart:15:3)
#4      compileStatement (package:dart_eval/src/eval/compiler/statement/statement.dart:23:12)
#5      compileBlock (package:dart_eval/src/eval/compiler/statement/block.dart:17:20)
#6      compileFunctionDeclaration (package:dart_eval/src/eval/compiler/declaration/function.dart:84:14)
#7      compileDeclaration (package:dart_eval/src/eval/compiler/declaration/declaration.dart:24:5)
#8      Compiler.compileSources.<anonymous closure>.<anonymous closure> (package:dart_eval/src/eval/compiler/compiler.dart:492:11)
#9      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
#10     Compiler.compileSources.<anonymous closure> (package:dart_eval/src/eval/compiler/compiler.dart:481:15)
#11     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633:13)
#12     Compiler.compileSources (package:dart_eval/src/eval/compiler/compiler.dart:477:32)
#13     Compiler.compile (package:dart_eval/src/eval/compiler/compiler.dart:164:12)
#14     Compiler.compileWriteAndLoad (package:dart_eval/src/eval/compiler/compiler.dart:547:21)
#15     main (package:coderunner_dart/test.dart:20:28)
#16     _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:297:19)
#17     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

Note, when I run other code examples like this, it works without errors.
Also, I tried to run the code (without dart_eval part, of course) in dartpad, it worked ok, FWIW.

[Noobware1]

Well, that's cause you can't create DateTime like this DateTime(1, 2); the default constructor for datetime is not added for some reason.

You can either wait for someone to add it or add it yourself.

[Ethan]

DateTime default constructor will be added in next release

[Noobware1]

Waiting patiently for the next release 🙏

[Ethan]

Forgot to close this, DateTime default constructor was added in v0.7.4