Passing nil as a function parameter?

[saward]

Hi,

What's the correct way for me to call a function, passing nil to one or more parameters? This example throws an error, when I'd expect it to work:

package main

import (
	"fmt"

	pongo2 "github.com/flosch/pongo2/v4"
)

func main() {
	tpl, err := pongo2.FromString("Nil func: {{ nilFunc(nil) }}")
	if err != nil {
		panic(err)
	}
	nilFunc := func(in interface{}) string {
		return fmt.Sprintf("%T", in)
	}
	out, err := tpl.Execute(pongo2.Context{"nilFunc": nilFunc})
	if err != nil {
		panic(err)
	}
	fmt.Println(out)
}

Error:

% go run main.go
panic: [Error (where: execution) in <string> | Line 1 Col 14 near 'nilFunc'] Calling a function using an invalid parameter

goroutine 1 [running]:
main.main()
        /Users/mark/temp/pt/main.go:19 +0x167
exit status 2

[flosch]

You can now pass nil to function aguments.