isNextNestedSyntax = (input, pos) => {
			pos = walkCssTokens.eatWhitespaceAndComments(input, pos);

			if (input[pos] === "}") {
				return false;
			}

			// According spec only identifier can be used as a property name
			const isIdentifier = walkCssTokens.isIdentStartCodePoint(
				input.charCodeAt(pos)
			);

			return !isIdentifier;
		}
@param {string} input input
@param {number} pos position
@returns {boolean} true, when next is nested syntax