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refs #88, fix signed/unsigned issue
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@ -2711,7 +2711,7 @@ GHC_INLINE path path::parent_path() const
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else {
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auto piter = end();
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auto iter = piter.decrement(_path.end());
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if(iter > _path.begin() + rootPathLen && *iter != '/') {
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if(iter > _path.begin() + static_cast<long>(rootPathLen) && *iter != '/') {
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--iter;
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}
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return path(_path.begin(), iter, format::generic_format);
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