>> If you set the var statement outside the main func, the issue is gone
because err is then a "global" var.
Not quite correct.
This is how it work and why `err` is used:
package main
import "fmt"
type closure03 struct {
err *error
f func() error
}
func (c *closure03) fn() {
*c.err = c.f()
}
func main() {
var err error
closure03 := &closure03{err: &err, f: f}
g := closure03.fn
g()
fmt.Println(err)
}
func f() error {
return fmt.Errorf("Some error occurred")
}
https://play.golang.org/p/ji_8QW1hIr
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