half-baked idea sketch - module level genericity for Go

module-generic-init.go

/* define generic package */

// file p.go
package p
typevar K generic.ComparableType  // poor man catagory
typevar V generic.AnyType         // ^^

import (...)

type X struct {
   k K
   v V
}

func (p *X) Get() (K, V) { return p.k, p.v }

// -----------

/* use generic package - module type directive decl. can be done various way */
package main

import (
    "p" //+build {K:string, V:[]byte}
)

func main() {
    var x = p.X {"this-thing", []byte("it is generic"),}

    var k string
    var v []byte
    k, v = x.Get()
}