Allow letOrNull to return R? #309

	name: Dart CI

	on:
	push:
	pull_request:

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	version: ["2.12", "2.13", "dev"]

	container:
	image: google/dart:${{ matrix.version }}

	steps:
	- uses: actions/checkout@v1
	- name: Install dependencies
	run: pub get --no-precompile
	- name: Run tests
	run: pub run test

	formatting:
	runs-on: ubuntu-latest

	container:
	image: google/dart:2.14

	steps:
	- uses: actions/checkout@v1
	- name: Install dependencies
	run: pub get --no-precompile
	- name: check formatting
	run: dart format --fix --set-exit-if-changed .

	lint:
	runs-on: ubuntu-latest

	container:
	image: google/dart:2.14

	steps:
	- uses: actions/checkout@v1
	- name: Install dependencies
	run: pub get --no-precompile
	- name: lint
	run: dart analyze --fatal-infos
	- name: docs
	run: dartdoc .
	- name: Verify package completness
	run: pub publish -n

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