A minor clarification. An error is any value that implements this interface
type error interface {
Error() string
}
Functions like errors.New and fmt.Errorf return an error implementation who's
base type (kind) is a string, but this is an implementation detail, there are
plenty of other error implementations, like os.PathError to pick just one,
which are a struct type containing additional details.
Why the type of errors.New is a string probably extends back to the days before
go 1 when we had this type
package os
type Error string
(From memory)
Dave
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