False positive about unused return values about unparam HOT 5 CLOSED

$ cat go.mod
module repro

go 1.12

require github.com/aws/aws-sdk-go-v2 v0.7.0
$ cat f.go
package main

import (
        "fmt"

        "github.com/aws/aws-sdk-go-v2/aws"
)

func main() {
        resolver := aws.EndpointResolverFunc(func(string, string) (aws.Endpoint, error) {
                return aws.Endpoint{}, nil
        })
        fmt.Println(resolver)
}
$ unparam .
$

#!/bin/bash

docker run -i golang:1.11.4-stretch <<-SCRIPT

        echo "installing unparam"
        export GO111MODULE=off # to install unparam properly
        go get -u mvdan.cc/unparam

        echo "setting up temp module"
        export GO111MODULE=on
        mkdir temp
        cd temp
        go mod init temp

        cat >f.go <<FILE
        package main

        import (
                "fmt"

                "github.com/aws/aws-sdk-go-v2/aws"
        )

        func main() {
                resolver := aws.EndpointResolverFunc(func(string, string) (aws.Endpoint, error) {
                        return aws.Endpoint{}, nil
                })
                fmt.Println(resolver)
        }
        FILE
        echo "downloading deps"
        go mod tidy

        echo "running unparam"
        unparam .

SCRIPT