Make return type of `TreeSink::elem_name` an associated type. #315

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	merge_group:
	types: [checks_requested]

	jobs:
	ci:
	name: CI
	runs-on: ubuntu-latest
	strategy:
	matrix:
	version: [stable, beta, nightly]
	steps:
	- uses: actions/checkout@v4

	- name: Set toolchain
	run: \|
	rustup set profile minimal
	rustup override set ${{ matrix.version }}

	- name: Init submodules
	run: git submodule update --init

	- name: Cargo bench
	run: cargo bench --all
	env:
	RUSTFLAGS: --cfg bench

	- name: Cargo test
	if: matrix.version != 'nightly'
	run: cargo test --all

	- name: Cargo doc
	if: matrix.version == 'nightly'
	run: cargo doc

	msrv:
	name: MSRV
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Install stable toolchain
	run: \|
	rustup set profile minimal
	rustup override set 1.65.0

	- run: cargo check --lib --all-features

	lint:
	name: Lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Install stable toolchain
	run: \|
	rustup set profile minimal
	rustup override set stable

	- name: Install clippy
	run: \|
	rustup component add clippy
	rustup component add rustfmt

	- name: Format
	run: cargo fmt --all -- --check

	- name: Run clippy
	run: cargo clippy --all-features --all-targets -- -D warnings

	build_result:
	name: Result
	runs-on: ubuntu-latest
	needs:
	- ci
	- lint
	- msrv

	steps:
	- name: Success
	if: ${{ !contains(needs..result, 'failure') && !contains(needs..result, 'cancelled') }}
	run: exit 0
	- name: Failure
	if: contains(needs..result, 'failure') \|\| contains(needs..result, 'cancelled')
	run: exit 1

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