# Go should indicate the version the module requires when a standard library
# import is missing. See golang.org/issue/48966.

! go build .
stderr '^main.go:3:8: package nonexistent is not in std \(.*\)$'
stderr '^note: imported by a module that requires go 1.99999$'

-- go.mod --
module example

go 1.99999
-- main.go --
package main

import _ "nonexistent"

func main() {}