json_encode_errors.go

// when does Go fail to encode JSON?
// https://go.dev/play/p/5ptv2ifv8_7
package main

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

type S struct {
	V float64 `json:"v"`
}

func main() {
	var s S

	s.V = math.Log(-1.0)

	b, err := json.Marshal(s)
	fmt.Print(b, err)
  // [] json: unsupported value: NaN
}