spec: allow func() func(). no longer ambiguous at top level, thanks to new semicolon rules.
spec: allow func() func().
no longer ambiguous at top level, thanks to new semicolon rules.

use gofmt layout for function types.

Fixes issue 528.

R=gri
CC=golang-dev
http://codereview.appspot.com/194077

tv42/old-go,pombredanne/go-deleteme,h8liu/golang,tianon/debian-golang,pombredanne/go-deleteme,gnanderson/go,nightlyone/golang,gnanderson/go,bdwalton/debian-golang,pombredanne/go-deleteme,apparentlymart/golang,h8liu/golang,pombredanne/go-deleteme,bdwalton/debian-golang,h8liu/golang,ssrl/go,nightlyone/golang,nightlyone/golang,nightlyone/golang,apparentlymart/golang,tianon/debian-golang,bdwalton/debian-golang,ssrl/go,pombredanne/go-deleteme,h8liu/golang,gnanderson/go,bdwalton/debian-golang,gnanderson/go,bdwalton/debian-golang,dsriram/golang,dsriram/golang,tv42/old-go,ssrl/go,ssrl/go,tianon/debian-golang,gnanderson/go,dsriram/golang,apparentlymart/golang,tianon/debian-golang,ssrl/go,apparentlymart/golang,h8liu/golang,bdwalton/debian-golang,h8liu/golang,nightlyone/golang,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,bdwalton/debian-golang,gnanderson/go,gnanderson/go,tv42/old-go,nightlyone/golang,tianon/debian-golang,apparentlymart/golang,h8liu/golang,nightlyone/golang,ssrl/go,apparentlymart/golang,tianon/debian-golang,dsriram/golang,tianon/debian-golang,ssrl/go,dsriram/golang,dsriram/golang,tv42/old-go,bdwalton/debian-golang,dsriram/golang,pombredanne/go-deleteme,tianon/debian-golang