go vet on playground emits message on printf %x with floating point

[bup...@gmail.com]

Playground: https://play.golang.org/p/2j2PlKwiA7B

Source code:

package main

   

import (
 "fmt"
)

   

func main() {
 fmt.Printf("%x\n", 5.0/7.0)
}

Expected: No message emits by go vet


Actual: go vet emits the following message:

./prog.go:8:2: Printf format %x has arg 5.0 / 7.0 of wrong type float64


According to https://golang.org/pkg/fmt/ , %x with floating point displays hexadecimal notation (with decimal power of two exponent), which is legal usage.

[Jake Montgomery]

This is a known problem: https://github.com/golang/go/issues/34993

It was fixed in Go 1.14: https://go-review.googlesource.com/c/tools/+/202041/

I'm curious what you use hex float for?