Test that a mounted module names a broken file beside its namespace, that a manifest refuses reads, and that each shipped module renders beside the modules its categories reach

reference.go

@@ -121,27 +121,6 @@ type noEntry struct{ seg string }
 
 func (e noEntry) Error() string { return fmt.Sprintf("no entry %q", e.seg) }
 
-// withMissingModules adds to err, where a path names nothing, each namespace of reads that
-// nothing in root provides, as the modules a loaded manifest reads and none loaded; or else
-// that no loaded manifest names a module to add, the mistake being the path's own.
-func withMissingModules(err error, root *folder, reads []string) error {
-	var ne noEntry
-	if !errors.As(err, &ne) {
-		return err
-	}
-	var missing []string
-	for _, namespace := range reads {
-		segs := strings.Split(namespace, ".")
-		if _, i := folderAt(root, segs); i < len(segs) {
-			missing = append(missing, namespace)
-		}
-	}
-	if len(missing) == 0 {
-		return fmt.Errorf("%w, and no loaded manifest names a module to add", err)
-	}
-	return fmt.Errorf("%w; is a module missing? The loaded modules read %s, which nothing loaded provides", err, strings.Join(missing, ", "))
-}
-
 // noDataNote adds to err, where a segment names nothing and f holds no data at all, that no
 // data is loaded.
 func (f *Generator) noDataNote(err error) error {