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cmd/vet: incorrect printf "invalid argument index" with ... argument #34007

cherrymui opened this issue Sep 1, 2019 · 2 comments

cmd/vet: incorrect printf "invalid argument index" with ... argument #34007

cherrymui opened this issue Sep 1, 2019 · 2 comments


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@cherrymui cherrymui commented Sep 1, 2019

What version of Go are you using (go version)?

tip (79669dc)

Does this issue reproduce with the latest release?


What operating system and processor architecture are you using (go env)?


What did you do?

package main

import (

func main() {
	s := []interface{}{"Hello", "playground"}
	fmt.Printf("%[2]s\n", s...)

What did you expect to see?

No vet warning.

I think this is a valid program, which prints "playground" as intended. It doesn't seem like a potential bug to me.

What did you see instead?

./prog.go:9:2: Printf format has invalid argument index [2]
@mvdan mvdan added this to the Unplanned milestone Sep 1, 2019
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@Matts966 Matts966 commented Sep 2, 2019

I sent a patch to fix this problem.

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@gopherbot gopherbot commented Sep 11, 2019

Change mentions this issue: analysis/passes/printf: emit linter message related to the index of arguments only when the number of arguments is precise.

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