kubernetes/vendor/golang.org/x/tools/internal/versions/types.go

// FileVersion returns a file's Go version.
// The reported version is an unknown Future version if a
// version cannot be determined.
func FileVersion(info *types.Info, file *ast.File) string { … }

// InitFileVersions initializes info to record Go versions for Go files.
func InitFileVersions(info *types.Info) { … }