[go-nuts] Is there some kind of memory write protection mechanism?

[digg]

Why does the following program crash?

package main

import "fmt"
import "unsafe"
import "reflect"

func main() {
    s := "keep"
    hdr := (*reflect.StringHeader)(unsafe.Pointer(&s))
    byteSequence := (*byte)(unsafe.Pointer(hdr.Data))
    fmt.Println(*byteSequence) // k
    *byteSequence = 'j' // crash here
    fmt.Println(s) // expect: jeep
}

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