No GOBIN cause go install failed

[doggy8088]

Here are the steps reproduce my problem:

1. install & use & env

   gvm install go1.14.6
   gvm use go1.14.6
   go env

2. The GOBIN="" is empty.

   I know the GOBIN's default value is $GOPATH/bin by default. But I can't run go install to install my command to $GOPATH/bin.

3. sample app & go install

   mkdir test1 && cd test1
   cat <<EOF > main.go
   package main
   import "fmt"
   func main() {
   fmt.Println("Hello")
   }
   EOF
   
   go install

   I'll get this:

   ~/test1$ go install
   go install: no install location for directory /home/will/test1 outside GOPATH
           For more details see: 'go help gopath'

4. When setup GOBIN env variable, all problem gone.

   export GOBIN=$GOPATH/bin
   go install