function parseCallExpression(encoded, returnType, context) {
  const operator = encoded[0];

  const parser = parsers[operator];
  if (!parser) {
    throw new Error(`unknown operator: ${operator}`);
  }
  return parser(encoded, returnType, context);
}
@param {Array} encoded The encoded expression.
@param {number} returnType The expected return type of the call expression.
@param {ParsingContext} context The parsing context.
@return {Expression} The parsed expression.