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.
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