I have go version go1.9beta1 linux/amd64 installed on ubuntu
I installed the go executable from the golang.org site
this is my go env :
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/dimitri/projects/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build366941307=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

While following the blog post "Running gofmt in Browser with 10 Lines of Code (Using GopherJS)" I get the following errors when I execute gopherjs build --minify. Any idea why it's failing?:

../../../../../../../../usr/local/go/src/runtime/error.go:134:3: undeclared name: throw ../../../../../../../../usr/local/go/src/runtime/error.go:136:12: undeclared name: CallersFrames ../../../../../../../../usr/local/go/src/runtime/error.go:144:3: undeclared name: throw ../../../../../../../../usr/local/go/src/runtime/error.go:148:3: undeclared name: throw ../../../../../../../../usr/local/go/src/runtime/error.go:153:3: undeclared name: throw ../../../../../../../../usr/local/go/src/runtime/error.go:156:3: undeclared name: throw