https://groups.google.com/g/golang-nuts
package main
import (
"fmt"
)
func main() {
const aa int = 0
var a int
fmt.Println(float64(1<<aa), a)
fmt.Println(float64(1<<a), a) // ./prog.go:11:21: invalid operation: 1
<< a (shift of type float64)
}
./prog.go:11:21: invalid operation: 1 << a (shift of type float64)
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