rust: move all crates in the main workspace to edition 2021

We've changed our minimum Rust version to 1.61.0 in the previous patch,
and edition 2021 predates that version.

rust/hg-core/Cargo.toml

@@ -1,52 +1,52 b''
 [package]
 name = "hg-core"
 version = "0.1.0"
 authors = ["Georges Racinet <[e-mail]>"]
 description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "hg"
 
 [dependencies]
 bitflags = "1.3.2"
 bytes-cast = "0.2.0"
 byteorder = "1.4.3"
 derive_more = "0.99.17"
 hashbrown = { version = "0.9.1", features = ["rayon"] }
 home = "0.5.3"
 im-rc = "15.0"
 itertools = "0.10.3"
 lazy_static = "1.4.0"
 libc = "0.2"
 ouroboros = "0.15.0"
 rand = "0.8.4"
 rand_pcg = "0.3.1"
 rand_distr = "0.4.3"
 rayon = "1.5.1"
 regex = "1.5.5"
 sha-1 = "0.10.0"
 twox-hash = "1.6.2"
 same-file = "1.0.6"
 tempfile = "3.1.0"
 thread_local = "1.1.4"
 crossbeam-channel = "0.5.0"
 micro-timer = "0.4.0"
 log = "0.4.8"
 memmap2 = { version = "0.5.3", features = ["stable_deref_trait"] }
 zstd = "0.5.3"
 format-bytes = "0.3.0"
 # once_cell 1.15 uses edition 2021, while the heptapod CI
 # uses an old version of Cargo that doesn't support it.
 once_cell = "1.14.0"
 
 # We don't use the `miniz-oxide` backend to not change rhg benchmarks and until
 # we have a clearer view of which backend is the fastest.
 [dependencies.flate2]
 version = "1.0.22"
 features = ["zlib"]
 default-features = false
 
 [dev-dependencies]
 clap = "2.34.0"
 pretty_assertions = "1.1.0"

rust/hg-cpython/Cargo.toml

@@ -1,19 +1,19 b''
 [package]
 name = "hg-cpython"
 version = "0.1.0"
 authors = ["Georges Racinet <[e-mail]>"]
-edition = "2018"
+edition = "2021"
 
 [lib]
 name='rusthg'
 crate-type = ["cdylib"]
 
 [dependencies]
 cpython = { version = "0.7.0", features = ["extension-module"] }
 crossbeam-channel = "0.5.2"
 hg-core = { path = "../hg-core"}
 libc = "0.2.119"
 log = "0.4.14"
 env_logger = "0.9.0"
 stable_deref_trait = "1.2.0"
 vcsgraph = "0.2.0"

rust/rhg/Cargo.toml

@@ -1,25 +1,25 b''
 [package]
 name = "rhg"
 version = "0.1.0"
 authors = [
     "Antoine Cezar <[e-mail]>",
     "Raphaël Gomès <[e-mail]>",
 ]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 atty = "0.2.14"
 hg-core = { path = "../hg-core"}
 chrono = "0.4.19"
 clap = "2.34.0"
 derive_more = "0.99.17"
 home = "0.5.3"
 lazy_static = "1.4.0"
 log = "0.4.14"
 micro-timer = "0.4.0"
 regex = "1.5.5"
 env_logger = "0.9.0"
 format-bytes = "0.3.0"
 users = "0.11.0"
 which = "4.2.5"
 rayon = "1.5.1"