[go-nuts] I know finalizers are not promised to be called, but is it too not promised?

[T L]

package main

import "time"
import "runtime"

type T1 struct{ i int }
type T2 struct{ i int }

func main() {
        t1 := new(T1)
        t2 := new(T2)
        
        runtime.SetFinalizer(t1, func(*T1) {println(1)})
        runtime.SetFinalizer(t2, func(*T2) {println(2)})
        runtime.GC()
        time.Sleep(time.Second * 2)
        
        // the program will output: 2
        // if I adjust the order of the declarations of t1 and t2,
        // the program will output: 1
}

Why the finalizer for the first declaration will not get called?

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