[SOLVED] CS package sexpr

package sexpr

import (
errors
//math/big // You will need to use this package in your implementation.
)

// ErrEval is the error value returned by the Evaluator if the contains
// an invalid token.
// See also https://golang.org/pkg/errors/#New
// and // https://golang.org/pkg/builtin/#error
var ErrEval = errors.New(eval error)

func (expr *SExpr) Eval() (*SExpr, error) {
panic(TODO: implement Eval)
}