pubspec: detect two identical keys

[guillermooo]

I think pubspec-related linting is going to be handled by dart_style. If so, it could detect cases like this:

name: dart_sample_console
version: 0.0.1
description: A minimal command-line application.
environment:
  sdk: '>=1.0.0 <2.0.0'
dependencies:
  semver: '>=1.0.0 <2.0.0'
  semver: '>=0.1.0 <1.0.0'
dev_dependencies:
  unittest: any

However, I'm not sure how dart_style is intended to run (on demand, constantly in the background...). In this particular case, it would be useful if the user got instant feedback, as the analysis server provides for .dart files.

[Fox32]

I think you mean the linter: https://github.com/dart-lang/linter

[munificent]

@Fox32 is correct. Can you re-file this bug there?

[guillermooo]

Done.