Hmm trying to work on the src code of `go doc` but every time I try to 
compile a ./doc binary it uses other src code, it doesn't look in the 
current directory am in, I have to force it `go build main.go` what going 
on here? 

gert@gert ~/Desktop/go/src/cmd/doc:master> go build

gert@gert ~/Desktop/go/src/cmd/doc:master> ls
dirs.go         doc             doc_test.go     main.go         pkg.go      
    testdata

I can see a doc binary getting created but its not build form the main.go 
in current directory, I deliberately put a syntax error in main?

gert@gert ~/Desktop/go/src/cmd/doc:master> go build main.go 
# command-line-arguments
./main.go:78:2: syntax error: unexpected --, expecting }

gert@gert ~/Desktop/go/src/cmd/doc:master> go env
GOARCH="amd64"
GOBIN="/Users/gert/bin"
GOCACHE="/Users/gert/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/gert/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/gert/Desktop/go/src/cmd/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments 
-fmessage-length=0 
-fdebug-prefix-map=/var/folders/dv/8tlwvjr91zjdyq4rk14lkkfm0000gn/T/go-build645754300=/tmp/go-build
 
-gno-record-gcc-switches -fno-common"



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