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rust-2018: switch hg-core and hg-cpython to rust 2018 edition...

rust-2018: switch hg-core and hg-cpython to rust 2018 edition Many interesting changes have happened in Rust since the Oxidation Plan was introduced, like the 2018 edition and procedural macros: - Opting in to the 2018 edition is a clear benefit in terms of future proofing, new (nice to have) syntactical sugar notwithstanding. It also has a new non-lexical, non-AST based borrow checker that has fewer bugs(!) and allows us to write correct code that in some cases would have been rejected by the old one. - Procedural macros allow us to use the PyO3 crate which maintainers have expressed the clear goal of compiling on stable, which would help in code maintainability compared to rust-cpython. In this patch are the following changes: - Removing most `extern crate` uses - Updating `use` clauses (`crate` keyword, nested `use`) - Removing `mod.rs` in favor of an aptly named module file Like discussed in the mailing list ( https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-July/132316.html ), until Rust integration in Mercurial is considered to be out of the experimental phase, the maximum version of Rust allowed is whatever the latest version Debian packages. Differential Revision: https://phab.mercurial-scm.org/D6597

Gregory Szorc - - Load All Authors

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      [package]

      name = "hgcli"

      version = "0.1.0"

      authors = ["Gregory Szorc <gregory.szorc@gmail.com>"]

      license = "GPL-2.0"

      build = "build.rs"

      [[bin]]

      name = "hg"

      path = "src/main.rs"

      [features]

      # localdev: detect Python in PATH and use files from source checkout.

      default = ["localdev"]

      localdev = []

      [dependencies]

      libc = "0.2.34"

      # We currently use a custom build of cpython and python27-sys with the

      # following changes:

      # * GILGuard call of prepare_freethreaded_python() is removed.

      # TODO switch to official release when our changes are incorporated.

      [dependencies.cpython]

      version = "0.1"

      default-features = false

      features = ["python27-sys"]

      git = "https://github.com/indygreg/rust-cpython.git"

      rev = "c90d65cf84abfffce7ef54476bbfed56017a2f52"

      [dependencies.python27-sys]

      version = "0.1.2"

      git = "https://github.com/indygreg/rust-cpython.git"

      rev = "c90d65cf84abfffce7ef54476bbfed56017a2f52"

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				[package]
				name = "hgcli"
				version = "0.1.0"
				authors = ["Gregory Szorc <gregory.szorc@gmail.com>"]
				license = "GPL-2.0"

				build = "build.rs"

				[[bin]]
				name = "hg"
				path = "src/main.rs"

				[features]
				# localdev: detect Python in PATH and use files from source checkout.
				default = ["localdev"]
				localdev = []

				[dependencies]
				libc = "0.2.34"

				# We currently use a custom build of cpython and python27-sys with the
				# following changes:
				# * GILGuard call of prepare_freethreaded_python() is removed.
				# TODO switch to official release when our changes are incorporated.
				[dependencies.cpython]
				version = "0.1"
				default-features = false
				features = ["python27-sys"]
				git = "https://github.com/indygreg/rust-cpython.git"
				rev = "c90d65cf84abfffce7ef54476bbfed56017a2f52"

				[dependencies.python27-sys]
				version = "0.1.2"
				git = "https://github.com/indygreg/rust-cpython.git"
				rev = "c90d65cf84abfffce7ef54476bbfed56017a2f52"