spec: field tags have to be identical when casting #6858
Description
Run this:
package main
type Message struct {
Id int `db:"id"`
Text string `db:"text"`
}
type Message2 struct {
Id int `json:"id" xml:"id,attr"`
Text string `json:"text"`
}
func main() {
msg := Message{1, "Hello"}
msg2 := Message2(msg)
_ = msg2
}
What is the expected output?
[no output]
What do you see instead?
cannot convert msg (type Message) to type Message2
Which compiler are you using (5g, 6g, 8g, gccgo)?
Which version are you using? (run 'go version')
go version devel +d744da8c8cbf Wed Sep 25 16:18:33 2013 -0400 darwin/amd64
Please provide any additional information below.
I'm trying to decouple my database layer from my service layer into separate packages.
Tags in one package are only relevant to that package. What I'd like to do is re-define
the struct in my service layer and cast it from the database layer. The fields inside
the struct are otherwise exactly the same, besides the tags.
Unfortunately it won't cast unless the tags are also exactly the same. The only solution
I have at this point is put the structs in a "common" package that both the
database and service layers share. But then I'm mixing tags...