$ go version
go version devel +a66af7280d Wed Feb 21 21:23:08 2018 +0000 linux/amd64
$ cat ~/go/src/app/app.go 
package main

import _ "test"
$ cat ~/go/src/test/test.go 
package test

import _ "test" // self-cycle in import graph
$ go list app test
can't load package: import cycle not allowed
package app
        imports test
        imports test
app
$ go list -e app test
app
test
$ go list -json app test
can't load package: import cycle not allowed
package app
        imports test
        imports test
^C                
$ go list -e -json app test
^C

cmd/go/internal/work.(*Builder).CompileAction(0xc00017d360, 0x1, 0x1, 0xc00021a000, 0x0)
        src/cmd/go/internal/work/action.go:330 +0xc0
cmd/go/internal/work.(*Builder).CompileAction.func1(0x8333c0)
        src/cmd/go/internal/work/action.go:339 +0x16e
cmd/go/internal/work.(*Builder).cacheAction(0xc00017d360, 0x8ad81b, 0x5, 0xc00021a000, 0xc0012799e0, 0x40c4d8)
        src/cmd/go/internal/work/action.go:300 +0x9f