This issue was originally filed by ngeoffray@google.com

class A {
  A() { hest--; }
}

main() {
  new A();
}

$ ./sdk/bin/dart2js bar.dart
bar.dart:2:9: Warning: No member named "hest" in class "A".
  A() { hest--; }
        ^^^^^^
bar.dart:2:9: Warning: No property named "hest" in class "A".
  A() { hest--; }
        ^^^^^^
Dart file bar.dart compiled to JavaScript: out.js