Weird.  It simplifies to this: https://play.golang.org/p/OsOhRMC6kBu

On Thursday, 3 June 2021 at 10:08:22 UTC+1 Jamil Djadala wrote:

>
> 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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