在项目目录中找不到包

I've been trying to solve this problem for the past two hours. I cannot, for the life of me, understand how the folks who developed Go did such a fine job with the language but such a terrible job with package management.

Here is my go env output:

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/<me>/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/<me>/Documents/Proj/go"
GORACE=""
GOROOT="/usr/local/opt/go/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/opt/go/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
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"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/z4/b3lxy_51405_b8pb_680l4xh0000gn/T/go-build063693521=/tmp/go-build -gno-record-gcc-switches -fno-common"

Notice that my GOPATH and GOROOT are set.

Here is the structure of my go workspace (/Users/<me>/Documents/Proj/go):

go/
|-bin/
|-pkg/
|-src/
  |--github.com/
    |--user/
      |--myproject/
        |--client/
          |--client.go
        |--main.go

Here is my client.go file:

// client.go
package client

type MyClient struct {}

this is my main.go file:

// main.go
package main

import "client"

func main() {}

When I run go build in the project root, I get this error:

main.go:4:2: cannot find package "client" in any of:
    /usr/local/opt/go/libexec/src/transport (from $GOROOT)
    /Users/<me>/Documents/Proj/go/src/transport (from $GOPATH)

The first time this happened, I tried to correct the path above:

// main.go
package main

import "github.com/user/myproject/client"

func main() {}

Then I got this error:

main.go:4:2: cannot find package "client" in any of:
    /usr/local/opt/go/libexec/src/transport (from $GOROOT)
    /Users/<me>/Documents/Proj/go/src/github.com/user/myproject/transport (from $GOPATH)

Which is bizarre, since the package exists at that exact path.

What am I doing wrong??

You should not import client but which path is coming from GOPATH/src, in this particular case github.com/user/myproject/client because that is your path.

I see that the way you describe your problem is not exactly the way it is on your computer. You replaced some things. That is understandable, you do not want to tell the world how your computer looks like. So you replaced your name with "<me>".

You also replaced the projectname, with MyProject in your question, that is also, just like the user name, a potential spot for an error which we cannot see, because you replaced it. Never use long names in development-paths on Windows, because Windows is doing dirty tricks with them, sometimes.

I am sure there is something the matter which is a problem. Try using your short-directory name in the go-path. Check this: https://superuser.com/questions/1182040/strange-short-path-name-on-windows