I discovered quite by accident and now I can't find anything saying as
such, but this example
package main
import (
"fmt"
"errors"
)
type Thing struct {
err error
}
type thing interface {
Error() string
}
func (t *Thing) Error() string {
return t.err.Error()
}
func main() {
t := new(Thing)
t.err = errors.New("testing")
fmt.Println(t)
}
https://play.golang.org/p/xBIGIvSZkqO
as you can see by running it, prints the error value inside the struct.
I am writing a library where I am using a 'pipeline' model so I can string
pointer methods together in a chain, which requires putting an error value
inside the structure, and then it does this when I print the struct. It's
quite handy but unexpected. I assume if a struct satisfies the error
interface it calls it to generate the string.
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