var golang.org/x/tools/internal/stdlib.versions

4 uses

	golang.org/x/tools/internal/stdlib (current package)
		stdlib.go#L53: func (v Version) String() string { return versions[v] }
		stdlib.go#L55: var versions [30]string // (increase constant as needed)
		stdlib.go#L58: 	for i := range versions {
		stdlib.go#L59: 		versions[i] = fmt.Sprintf("go1.%d", i)