mercurial-rust Subpackage of mercurial

This subpackage provides following Mercurial components implemented in Rust: The `rustext` extension speeds up some functionality of Mercurial, e.g. ancestry computations in revision graphs, status or discovery of differences between repositories. The experimental `rhg` executable implements a subset of the functionality of `hg` using only Rust, to avoid the startup cost of a Python interpreter. This subset is initially small but grows over time as `rhg` is improved. When fallback to the Python implementation is configured, `rhg` aims to be a drop-in replacement for `hg` that should behave the same, except that some commands run faster.

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