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	/// The `*` extension is an edge-case for config sub-options that apply to all			/// The `*` extension is an edge-case for config sub-options that apply to all
	/// extensions. For now, only `:required` exists, but that may change in the			/// extensions. For now, only `:required` exists, but that may change in the
	/// future.			/// future.
	const SUPPORTED_EXTENSIONS: &[&[u8]] =			const SUPPORTED_EXTENSIONS: &[&[u8]] =
	&[b"blackbox", b"share", b"sparse", b"narrow", b"*"];			&[b"blackbox", b"share", b"sparse", b"narrow", b"*"];

	fn check_extensions(config: &Config) -> Result<(), CommandError> {			fn check_extensions(config: &Config) -> Result<(), CommandError> {
				if let Some(b"*") = config.get(b"rhg", b"ignored-extensions") {
				// All extensions are to be ignored, nothing to do here
				return Ok(());
				}

	let enabled: HashSet<&[u8]> = config			let enabled: HashSet<&[u8]> = config
	.get_section_keys(b"extensions")			.get_section_keys(b"extensions")
	.into_iter()			.into_iter()
	.map(\|extension\| {			.map(\|extension\| {
	// Ignore extension suboptions. Only `required` exists for now.			// Ignore extension suboptions. Only `required` exists for now.
	// `rhg` either supports an extension or doesn't, so it doesn't			// `rhg` either supports an extension or doesn't, so it doesn't
	// make sense to consider the loading of an extension.			// make sense to consider the loading of an extension.
	extension.split_2(b':').unwrap_or((extension, b"")).0			extension.split_2(b':').unwrap_or((extension, b"")).0

tests/test-rhg.t


	$ echo "[extensions]" >> $HGRCPATH			$ echo "[extensions]" >> $HGRCPATH
	$ echo "blackbox:required = yes" >> $HGRCPATH			$ echo "blackbox:required = yes" >> $HGRCPATH
	$ rhg files			$ rhg files
	a			a
	$ echo "*:required = yes" >> $HGRCPATH			$ echo "*:required = yes" >> $HGRCPATH
	$ rhg files			$ rhg files
	a			a

				We can ignore all extensions at once

				$ echo "[extensions]" >> $HGRCPATH
				$ echo "thisextensionbetternotexist=" >> $HGRCPATH
				$ echo "thisextensionbetternotexisteither=" >> $HGRCPATH
				$ $NO_FALLBACK rhg files
				unsupported feature: extensions: thisextensionbetternotexist, thisextensionbetternotexisteither (consider adding them to 'rhg.ignored-extensions' config)
				[252]

				$ echo "[rhg]" >> $HGRCPATH
				$ echo "ignored-extensions=*" >> $HGRCPATH
				$ $NO_FALLBACK rhg files
				a