fmt: %+v doesn't work for types external to package

[gopherbot]

by stephen.searles@shipwire.com:

What does 'go version' print?

1.3

What steps reproduce the problem?
If possible, include a link to a program on play.golang.org.

http://play.golang.org/p/wEN2KnN4CM

What happened?

Only type declared in current package gets field names

What should have happened instead?

Either make the field names work for imported packages, or the documentation should have
made this behavior clear. Currently, it just says: "when printing structs, the plus
flag (%+v) adds field names".

[minux]

Comment 1:

both *net/url.URL and image.Rect have String method, so %+v
will just call it to convert it to string.
This behavior is well documented.
http://play.golang.org/p/kLP4FCTl8U

Labels changed: added repo-main.

Status changed to WorkingAsIntended.