What version of Go are you using (go version)?

$ go version
go version go1.14 linux/amd64

Does this issue reproduce with the latest release?

Yes. And play.golang.org

What operating system and processor architecture are you using (go env)?

Debian Linux amd64

What did you do?

Try to parse an address using net/mail.

https://play.golang.org/p/PzvfiO0LVT7

package main

import (
	"fmt"
	"net/mail"
)

func main() {
	_, err := mail.ParseAddressList("foo@bar.com <foo@bar.com>")
	if err != nil {
		fmt.Println("Error: ", err)
	}
}

What did you expect to see?

For it to be accepted. I don't know if it's standards compliant, but it's unambiguous to me.

What did you see instead?

Parsing the address failed with an error. "Expected comma".