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* Port directory enumeration related code to WASI For now wasi-libc does not include fts(3) implementation, so mark features depending on it as unsupported on WASI. Once wasi-libc includes fts or we decide to implement and maintain our own fts-like API, we can remove these `#if os(WASI)` guards. wasi-libc issue tracking fts support: https://github.com/WebAssembly/wasi-libc/issues/520 Also, wasi-libc defines some constants in a way that ClangImporter can't understand, so we need to grab them manually through _FoundationCShims in function call form. * Delegate error throwing decisions to the delegate