Inlining simple math stub functions fails

math.go

package main

import (
    "fmt"
    "math"
)

func Sqr2() float64 {
    return 2.0*2.0
}

func Sqrt2() float64 {
    return math.Sqrt(2.0)
}

func main() {
    fmt.Println(Sqr2)
    fmt.Println(Sqrt2)
}

// $ go build -gcflags -m math.go
// # command-line-arguments
// ./math.go:8: can inline Sqr2
// ./math.go:17: Sqr2 escapes to heap
// ./math.go:18: Sqrt2 escapes to heap
// ./math.go:17: main ... argument does not escape
// ./math.go:18: main ... argument does not escape

// Note that Sqr2 can be inlined, but Sqrt2 cannot.
// While not important for this trivial example,
// it can result in signiciant and unnecessary overhead
// for simple custom types, e.g. vectors.