golang编译错误：找不到导入

Question

I am trying to run go build command in a directory $GOPATH/src/call/httptest:

maks@myMac ~/Dropbox/golang/src/call/httptest $ go build
# call/httptest
./domain.go:4: can't find import: "call"

Have error ./domain.go:4: can't find import: "call"

The beginning of domain.go file:

package httptest

import (
    "call" // line 4 - error is here
)

I can successfully build in $GOPATH/src/call directory:

maks@myMac ~/Dropbox/golang/src/call $ go build

Why can't I import call in $GOPATH/src/call/httptest/domain.go file although call is in $GOPATH/src directory?

Gopath is the following:

$ echo $GOPATH
/Users/maks/Dropbox/golang

$ go version
go version go1.4.3 darwin/amd64

Update

$ go env
GOARCH="amd64"
GOBIN=""
GOCHAR="6"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/maks/Dropbox/golang"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="0"

Answer 1

It was kinda "cache" issue. After I change couple lines in $GOPATH/src/call, I become able to build in $GOPATH/src/call/httptest without that import error.