rust: Make the hg-cpython crate default to Python 3
This default is used when running `cargo` manually such as for `cargo test`.
`setup.py` and `Makefile` both configure the Python major version explicitly.
Differential Revision: https://phab.mercurial-scm.org/D11618
[package]
name = "hg-cpython"
version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"]
edition = "2018"
[lib]
name='rusthg'
crate-type = ["cdylib"]
[features]
default = ["python3"]
# Features to build an extension module:
python27 = ["cpython/python27-sys", "cpython/extension-module-2-7"]
python3 = ["cpython/python3-sys", "cpython/extension-module"]
# Enable one of these features to build a test executable linked to libpython:
# e.g. cargo test --no-default-features --features python27-bin
python27-bin = ["cpython/python27-sys"]
python3-bin = ["cpython/python3-sys"]
[dependencies]
crossbeam-channel = "0.4"
hg-core = { path = "../hg-core"}
libc = '*'
log = "0.4.8"
env_logger = "0.7.1"
stable_deref_trait = "1.2.0"
[dependencies.cpython]
version = "0.6.0"
default-features = false