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Now that path::operator/=(basic_string_view<value_type>) works directly from the string argument, instead of constructing a temporary path from the string, it's potentially more efficient to do 'path(x) /= s' instead of 'x / s'. This changes the only relevant place in the library. * src/filesystem/std-dir.cc (filesystem::_Dir::advance): Append string to lvalue to avoid creating temporary path. Tested x86_64-linux, committed to trunk.
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