The template package is the only one that has a doc.go not mentioned
in its Makefile.
This doesn't seem to bother godoc, but seems like a bug to me.
$ for d in $(find pkg -name doc.go); do echo $d; grep doc.go $(dirname $d)/Makefile; done
pkg/fmt/doc.go
doc.go\
pkg/go/doc/doc.go
doc.go\
pkg/gob/doc.go
doc.go\
pkg/html/doc.go
doc.go\
pkg/old/template/doc.go
doc.go\
pkg/sync/atomic/doc.go
doc.go\
pkg/template/doc.go
R=r
CC=golang-dev
https://golang.org/cl/
5003047
TARG=template
GOFILES=\
+ doc.go\
exec.go\
funcs.go\
helper.go\