What steps will reproduce the problem?

gccgo -c -o foobar.o foo.go bar.go

What do you see instead?

bar.go:3:8: error: expected package
foo.go:2:1: error: control reaches end of non-void function
foo.go:2:9: error: use of undefined type ‘Y’
In function ‘foo.String.N5_foo.Y’:
go1: internal compiler error: in make_receiver_parm_decl, at
go/gofrontend/gogo-tree.cc:1408

Which compiler are you using (5g, 6g, 8g, gccgo)?

gccgo

Which operating system are you using?

linux

Which revision are you using?  (hg identify)

URL: svn://gcc.gnu.org/svn/gcc/trunk
Repository Root: svn://gcc.gnu.org/svn/gcc
Repository UUID: 138bc75d-0d04-0410-961f-82ee72b054a4
Revision: 167678

Attachments:

1. foo.go (43 bytes)
2. bar.go (90 bytes)