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Reject fields, values and members that a type and its extensions declare twice #1352

	name: Pull request
	on:
	pull_request:
	types: [ opened, reopened, synchronize ]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	java: [ '11', '17', '21', '25' ]
	steps:
	- name: Checkout
	uses: actions/checkout@v7
	- name: Setup java
	uses: actions/setup-java@v6
	with:
	java-version: ${{ matrix.java }}
	distribution: 'temurin'
	- name: Cache Maven packages
	uses: actions/cache@v6
	with:
	path: ~/.m2
	key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
	restore-keys: ${{ runner.os }}-m2
	- name: Build with Maven
	run: mvn --batch-mode --update-snapshots verify