enterObjectPattern(pattern, onIdent) {
		for (
			let propIndex = 0, len = pattern.properties.length;
			propIndex < len;
			propIndex++
		) {
			const prop = pattern.properties[propIndex];
			this.enterPattern(prop, onIdent);
		}
	}
@param {ObjectPattern} pattern object pattern
@param {OnIdent} onIdent callback