cmd/gc: internal compiler error for interface method expressions at package-level #4495
Description
The gc compiler reports:
prog.go:38: internal compiler error: lookdot badwidth m method(*struct {}) func() int
7fa553661e50
for interface method expressons at the package level:
http://play.golang.org/p/L7RiV2PHOE
gccgo compiles and runs the same code w/o issues.