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

$ go version
go version go1.19.1 darwin/arm64

Does this issue reproduce with the latest release?

yes

What did you do?

package main

import "sort"

func main() {
	s := []string{"a", "z", "ooo"}
	sort.Slice(less(s))
}

func less(s []string) ([]string, func(i, j int) bool) {
	return s, func(i, j int) bool {
		return s[i] < s[j]
	}
}

What did you expect to see?

No diagnostic message about the first argument to sort.Slice

What did you see instead?

My editor highlights the sort.Slice with a warning:

sortslice: sort.Slice's argument must be a slice; is called with ([]string, func(i int, j int) bool)