{"go1.21.1", "go1.19", "go1.19"},     // file downgrade permitted (module version is >= go1.21)
	} {
		var src string
		if test.fileVersion != "" {
			src = "//go:build " + test.fileVersion + "\n"
		}
		src += "package p"

		conf := Config{GoVersion: test.goVersion}
		versions := make(map[*ast.File]string)
		var info Info
		info.FileVersions = versions