Collection<VirtualFile> (final Collection<VirtualFile> result, final CompileContext context) { final ProjectFileIndex index = ProjectRootManager.getInstance(context.getProject()).getFileIndex(); final Set<VirtualFile> set = new HashSet<>(); final Set<Module> modules = new HashSet<>(); for (VirtualFile file : result) { if (index.getSourceRootForFile(file) == null) { set.add(file); ContainerUtil.addIfNotNull(modules, index.getModuleForFile(file)); } } if (!set.isEmpty()) { ((CompileContextEx)context).addScope(new FileSetCompileScope(set, modules.toArray(Module.EMPTY_ARRAY))); } return result; }