Added Area-Analyzer, Triaged labels.

Added this to the 1.3 milestone.
Removed Priority-Unassigned label.
Added Priority-Medium label.

First off, there are no warnings at all being generated. The warning that you have above, is actually a hint. In Dart only the static types are used to generate warnings. In this case f and b are both dynamic since they are declared with 'var'.

If the 'var's are changed to the type, warnings appear in both cases.

class Foo {
  get foo=>null;
}
class Bar {
  var _bar;
  set bar(x)=>_bar=x;
}
main() {
  Foo f=new Foo();
  f.foo=1; // warning
  Bar b=new Bar();
  print(b.bar); // warning
}

Leaving the issue open to create the missing hint on 'foo'.

Also- All hint related issues are being marked as Milestone-Later.

cc @bwilkerson.
Set owner to @jwren.
Removed this from the 1.3 milestone.
Added this to the Later milestone.
Changed the title to: "[Hint] Add a hint- Missing warning for attempt to set the unsettable but gettable field".

This comment was originally written by @tatumizer

Leaving the issue open to create the missing hint on 'foo'.
But that was the whole issue.
"Attempt to get the ungettable but settable field is flagged, but the reverse is not true"
I never complained about anything else. And does it really matter that you call warning "a hint"? It's yellow anyway.
Thanks for paying attention.

I forgot to say thank you for the feedback.

I'm not disagreeing with you, and we'll add it as soon as we can spend more time on hints.

If you are interested in contributing to the analyzer, it is open source, we'd be happy to have external contributors! The change to add this missing hint won't be hard, just a bit tedious.

This comment was originally written by @tatumizer

No problem :-). I know you are working hard guys. I couldn't be even 1/10
as productive as any of you, even in my best years (which are a couple of
decades in the past), so any "contribution" from me will take more time to
review and fix than to implement in-house.
Thanks again, I appreciate your work, and I think the language has a great
future. I really enjoy programming again (which I thought would never
happen).

Added Analyzer-Hint label.

Changed the title to: "Add a hint- Missing warning for attempt to set the unsettable but gettable field".

Removed Type-Defect label.
Added Type-Enhancement label.

Removed this from the Later milestone.
Added Oldschool-Milestone-Later label.

Removed Oldschool-Milestone-Later label.

This is implemented as a strong mode warning.

$ cat 17166.dart
class Foo {
  get foo=>null;
}
class Bar {
  var _bar;
  set bar(x)=>_bar=x;
}
main() {
  var f=new Foo();
  f.foo=1; // no warning
  var b=new Bar();
  print(b.bar); // warning!
}

$ dartanalyzer --strong 17166.dart
Analyzing [17166.dart]...
[warning] No setter named 'foo' in class 'Foo' (/Users/srawlins/code/17166.dart, line 10, col 5)
[warning] The getter 'bar' is not defined for the class 'Bar' (/Users/srawlins/code/17166.dart, line 12, col 11)
[hint] The value of the field '_bar' is not used (/Users/srawlins/code/17166.dart, line 5, col 7)
2 warnings and 1 hint found.