if (!file.isDirectory) {
                        val stub = buildStubByVirtualFile(file, binaryClassCache) ?: return true
                        put(file, stub)
                    }
                    return true
                }
            })
        }

    private fun buildStubByVirtualFile(file: VirtualFile, binaryClassCache: ClsKotlinBinaryClassCache): KotlinFileStubImpl? {