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Not-implemented iteration for objects #4

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DartBot opened this issue Oct 10, 2011 · 1 comment
Closed

Not-implemented iteration for objects #4

DartBot opened this issue Oct 10, 2011 · 1 comment
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closed-invalid Closed as we don't believe the reported issue is generally actionable

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DartBot commented Oct 10, 2011

This issue was originally filed by vjeuxx...@gmail.com

What steps will reproduce the problem?

  main() {
    var obj = {"a": 1, "b": 2};
    for (var key in obj) {
      print(key);
    }
  }
http://try-dart-lang.appspot.com/s/EmEO

What is the expected output?
a
b

What do you see instead?
NoSuchMethodException - receiver: '' function name: 'iterator$named' arguments: []]

What version of the product are you using? On what operating system?
Online dart compiler.

Please provide any additional information below.

In the specification it says that "for in" construct is desugared into var n0 = e.iterator(); while (n0.hasNext()) { finalVarOrType id = n0.next();
It is not working because obj.iterator does not exist.
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DartBot commented Oct 10, 2011

This comment was originally written by antonm@google.com

obj should be of type Map which doesn't implement Iterable. Please, try for (key in obj.getKeys()).

Added Invalid label.

@DartBot DartBot added Type-Defect closed-invalid Closed as we don't believe the reported issue is generally actionable labels Oct 10, 2011
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copybara-service bot pushed a commit that referenced this issue Oct 22, 2024
@pq
[element model] fix unsafe ConstructorMember cast
f65f719 
See: b/374689139.

https://dart-review.googlesource.com/c/sdk/+/390941 is blocking an SDK roll.

Root cause:


```
Action threw an exception: type 'ConstructorMember' is not a subtype of type 'ConstructorFragment' in type cast
#0      InterfaceTypeImpl.constructors2.<anonymous closure> (package:analyzer/src/dart/element/type.dart:569)
#1      MappedListIterable.elementAt (dart:_internal/iterable.dart:435)
#2      ListIterator.moveNext (dart:_internal/iterable.dart:364)
#3      new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189)
#4      new _GrowableList.of (dart:core-patch/growable_array.dart:150)
#5      new List.of (dart:core-patch/array_patch.dart:39)
#6      ListIterable.toList (dart:_internal/iterable.dart:224)
#7      InterfaceTypeImpl.constructors2 (package:analyzer/src/dart/element/type.dart:570)
#8      _Visitor._hasConstConstructorInvocation (package:linter/src/rules/prefer_const_constructors_in_immutables.dart:110)
#9      _Visitor.visitConstructorDeclaration (package:linter/src/rules/prefer_const_constructors_in_immutables.dart:58)
```


To verify the fix locally:

```
  solo_test_X() async {
    await assertNoErrorsInCode(r'''
class A<T> {}
''');

    var A = findElement.class_('A').instantiate(
      typeArguments: [intType],
      nullabilitySuffix: NullabilitySuffix.none,
    );
    A.constructors2;
  }
```


Bug: b/374689139
Change-Id: I70034d938d840dc0c3939db27e7116164e4617e9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/391483
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Phil Quitslund <pquitslund@google.com>
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@MLDenzzl MLDenzzl mentioned this issue Oct 28, 2024
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