Eval panics which is not documented

[pjebs]

The following program sample.go triggers an unexpected result

package main

import (
	"fmt"
	"github.com/traefik/yaegi/interp"
	"github.com/traefik/yaegi/stdlib"
)

func main() {
	i := interp.New(interp.Options{})
	i.Use(stdlib.Symbols)

	_ , err := i.Eval(`import "fmt"`)
	if err != nil {
		fmt.Println(err)
	}
	_ , err = i.Eval(`import dataframe "github.com/rocketlaunchr/dataframe-go"`)
	if err != nil {
		fmt.Println(err)
	}
	_ , err = i.Eval(`func X(args ...any) []string {
			typs := []string{}
			for _, v := range args {
				typs = append(typs, fmt.Sprintf("%T", v))
			}
			return typs
		}`)
	if err != nil {
		fmt.Println(err)
	}

	_, err = i.Eval(`var s1 *dataframe.SeriesInt64  = dataframe.NewSeriesInt64("day",nil,1,2,3,4,5,6,7,8)`) <======= PANICS HERE
	if err != nil {
		fmt.Println("err:", err.Error())
	}
	

	v, err := i.Eval("X(GlobalVar)")
	if err != nil {
		panic(err)
	}

	fmt.Println(v.Interface().([]string))

}

Expected result

No panic. Perhaps an error because the `import dataframe "github.com/rocketlaunchr/dataframe-go"` is not loaded.

eg. import "github.com/rocketlaunchr/dataframe-go" error: unable to find source related to: "github.com/rocketlaunchr/dataframe-go". Either the GOPATH environment variable, or the Interpreter.Options.GoPath needs to be set

Got

Panic:
runtime error: invalid memory address or nil pointer dereference

Yaegi Version

v0.16.1

Additional Notes

i.Eval is not documented to panic.
It does panic when it should return an error saying that dataframe is not recognised.

[pjebs]

A temporary workaround:

i := interp.New(interp.Options{})
eval := func(arg string) (res reflect.Value, err error) {
		defer func() {
			if r := recover(); r != nil {
				err = fmt.Errorf("%v", r)
			}
		}()
		return i.Eval(arg)
	}