Now the sample analyzer can be run locally with:

dart dev/bots/analyze-sample-code.dart --temp=/tmp/samples

And it leaves /tmp/samples around so you can take a look at the code that was generated to see if it's the artificial environment that the samples are evaluated in that is the culprit for a failed analysis.

Before, you had to specify the whole path to the dart executable, and had to modify the code to keep the tempdir around.