[go-nuts] Why does one string concatenation escape, but the other not?

[tapi...@gmail.com]

package main

import "testing"

var s33 = []byte{32: 'b'}

var a = string(s33)

func main() {
    x := a + a // a + a does not escape
    println(x)
}

func Benchmark_e_33(b *testing.B) {
    var x string
    for i := 0; i < b.N; i++ {
        x = a + a // a + a escapes to heap
    }
    println(x)
}

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