Why can't I run a dart file inside a dir?

Issue I have a simple dart project, it has file structure like: darttest tree . ├── packages │   ├── browser -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/browser-0.5.20/lib │   ├── meta -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/meta-0.5.20/lib │   ├── start -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/start-0.0.8/lib │   └── unittest -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/unittest-0.5.20/lib ├── pubspec.lock ├──

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Why can't I run a dart file inside a dir?

Issue I have a simple dart project, it has file structure like: darttest tree . ├── packages │   ├── browser -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/browser-0.5.20/lib │   ├── meta -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/meta-0.5.20/lib │   ├── start -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/start-0.0.8/lib │   └── unittest -> /Users/freewind/.pub-cache/hosted/pub.dartlang.org/unittest-0.5.20/lib ├── pubspec.lock ├──

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