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Rust

fix: subtyping and coercion rules for optional types #1585

	name: Rust
	on:
	push:
	branches:
	- master
	pull_request:

	env:
	CARGO_TERM_COLOR: always # Force Cargo to use colors
	TERM: xterm-256color

	jobs:
	rust:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Cache cargo build
	uses: actions/cache@v4
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
	- name: Build
	run: \|
	cargo build
	- name: Run tests
	run: \|
	cargo test --no-default-features -- --color always
	cargo test -- --color always
	cargo test --features all -- --color always
	- name: fmt
	run: cargo fmt -v -- --check
	- name: lint
	run: cargo clippy --features all --tests -- -D warnings
	- name: doc
	run: cargo doc
	fuzzing:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Install cargo-fuzz
	run: \|
	cargo install cargo-fuzz
	- name: Build fuzzers
	run: \|
	cd rust/candid
	cargo +nightly fuzz build