I'm trying to define a type constraint which is a union of interface.
type ReadStringer interface {
io.Reader | fmt.Stringer
}
Unfortunately the compiler rejects it:
cannot use io.Reader in union (io.Reader contains methods)
cannot use fmt.Stringer in union (fmt.Stringer contains methods)
I understand it's not possible, but I don't understand why.
Is there a logical problem ? Could it be supported in a future Go version ?
My goal is to define a function that accepts a parameter, then check at the
execution time if it implements an interface or the other.
I could use "any", but it would be less safe.
Thank you.
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