view .arcconfig @ 42536:2dcee6497b0b

rust-dirstate: add "dirs" Rust implementation

Following the work done in d1786c1d34fa and working towards the goal of a
complete Rust implementation of the dirstate, this rewrites the `dirs` class.

There is already a C implementation, which relies heavily on CPython hacks and
protocol violations for performance, so I don't expect this to perform as well
for now, as this is very straight-forward code.
The immediate benefits are new high-level documentation and some unit tests.

Differential Revision: https://phab.mercurial-scm.org/D6393

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