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I have quite opposite information from one of Dart authors, as response to my bug report: https://code.google.com/p/dart/issues/detail?id=23148 https://code.goo

• skybrian 12y ago
  It's confusing, but that's not a contradiction. The Dart spec defines the official set of errors and warnings and that particular snippet of code is within the spec, even though it's broken. The dartanalyzer tool follows the spec. But there are other possibilities. The dartanalyzer has hints which aren't part of the spec. Other tools (like the linter and DDC) can and will check for more problems. You could try refiling that as a feature request that the analyzer should provide a hint here, or perhaps try out DDC.