What is the idiomatic way to use errors.Is with a

Question

custom struct error?
type MyErr struct {
fields....
}

func (e *MyErr) Error() string {
return fmt.Sprintf("failed with %s", field1,...)
}

0

11.01.2021

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how do I check an error is of type` MyErr`? I can't use errors.Is(err, MyErr)

0

11.01.2021

Why not?

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11.01.2021

it expects an instance, not a type. So I wonder if doing just errors.Is(err, &MyErr{}) is the correct way

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11.01.2021

Type assert

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11.01.2021

that's what I'm currently using, I thought Is/As is the preferred way

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11.01.2021

Not necessarily, it depends

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11.01.2021

Roman Sharkov · Accepted Answer

question unclear

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11.01.2021