The current implementation prints a log, "invalid program: unexpected
type for embedded field", when the form *package.ident is embedded in
a struct declaration.

Note that since valid qualified identifiers must be exported, the result
for a valid program does not change.

Change-Id: If8b9d7056c56b6a6c5482eb749168a63c65ef685
Reviewed-on: https://go-review.googlesource.com/84436Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>