Overloading of functions does not work.

[Matthias Kesler]

The following program sample.go triggers an unexpected result

package main

import (
	"encoding/json"
	"fmt"
	"time"
)

type jsonTime time.Time

func (j *jsonTime) UnmarshalJSON(b []byte) error {
	var n json.Number
	if err := json.Unmarshal(b, &n); err != nil {
		return err
	}
	var unix int64

	if t, err := n.Int64(); err == nil {
		unix = t
	} else {
		f, err := n.Float64()
		if err != nil {
			return err
		}
		unix = int64(f)
	}
	*j = jsonTime(time.Unix(unix, 0))
	return nil
}

type data struct {
	A jsonTime  `json:"a"`
	B *jsonTime `json:"b"`
}

func main() {
	string := []byte(`{"a":1704303550,"b":1704303250}`)

	var parsed data

	err := json.Unmarshal(string, &parsed)
	fmt.Printf("Err: %v\n", err)

	fmt.Printf("a: %s\n", time.Time(parsed.A))
	fmt.Printf("b: %v\n", time.Time(*parsed.B))
}

Expected result

Err: <nil>
a: 2024-01-03 17:39:10 +0000 UTC
b: 2024-01-03 17:34:10 +0000 UTC

Got

Err: json: cannot unmarshal string into Go struct field .a of type time.Time
a: 0001-01-01 00:00:00 +0000 UTC
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x4be9ae]

Yaegi Version

v0.15.1

Additional Notes

No response