rust: remove support for `re2` With the performance issues with `regex` figured out and fixed in previous patches and `regex` newly gaining support for empty alternations, there is no reason to keep `re2` around anymore. It's only *marginally* faster at creating the regex which saves at most a couple of ms, but gets beaten by `regex` in every other aspect. This removes the Rust/C/C++ bridge (hooray!), the `with-re2` feature, the conditional code that goes with it, the documentation and relevant part of the debug/module output. Differential Revision: https://phab.mercurial-scm.org/D8594

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[package]

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name = "hg-core"

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version = "0.1.0"

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authors = ["Georges Racinet <gracinet@anybox.fr>"]

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description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"

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edition = "2018"

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[lib]

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name = "hg"

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[dependencies]

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byteorder = "1.3.4"

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hex = "0.4.2"

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lazy_static = "1.4.0"

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memchr = "2.3.3"

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rand = "0.7.3"

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rand_pcg = "0.2.1"

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rand_distr = "0.2.2"

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rayon = "1.3.0"

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regex = "1.3.9"

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twox-hash = "1.5.0"

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same-file = "1.0.6"

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crossbeam = "0.7.3"

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micro-timer = "0.2.1"

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log = "0.4.8"

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[dev-dependencies]

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clap = "*"

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memmap = "0.7.0"

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pretty_assertions = "0.6.1"

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tempfile = "3.1.0"