feat(fe): add warning for 'x==y;' statement #3877

	# Copyright (C) 2020 Matthew Glazar
	# See end of file for extended copyright information.

	# These jobs ensure CI infrastructure is working as expected.

	name: CI self-check
	on:
	push:
	pull_request:
	types: [opened, synchronize]

	jobs:
	# Double-check that our worker is still running scripts as ARM64 (not x86_64).
	macos-arm:
	name: macOS Apple Silicon (ARM64/AArch64)
	runs-on: stracle-macos-aarch64
	steps:
	- name: check architecture
	run: \|
	current_arch="$(arch)"
	printf 'current arch: %s\n' "${current_arch}" >&2
	case "${current_arch}" in
	arm64*)
	printf 'architecture OK\n' >&2
	;;
	*)
	printf 'error: unexpected architecture\n' >&2
	exit 1
	;;
	esac

	# quick-lint-js finds bugs in JavaScript programs.
	# Copyright (C) 2020 Matthew Glazar
	#
	# This file is part of quick-lint-js.
	#
	# quick-lint-js is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# quick-lint-js is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with quick-lint-js. If not, see <https://www.gnu.org/licenses/>.

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