Unexpected behaviour of go linker?

list.go

package list

var List map[string]string = make(map[string]string)

sublist1.go

package sublist1

import "list"

func init() {
	list.List["sublist1"] = "whatever"
}

sublist2.go

package sublist2

import "list"

func init() {
	list.List["sublist2"] = "whatever"
}

test.go

package main

import (
	"list"
)

func main() {
	for k, v := range list.List {
		println(k,"=>",v)
	}
}