[go-nuts] methods on C types

[djadala]

Hi,
where is documented that methods can be created on C types ?

This works with go1.12.4, linux:
https://play.golang.org/p/gXpHCFOgDDg

package main

import (
    "C"
    "fmt"
)

func (i *C.int) Inc() {
    *i++
}

func main() {
    var i C.int
    i.Inc()
    fmt.Println(i)
}


Thanks

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