view rust/Cargo.toml @ 48004:58fe6d127a01 stable

pep-517: remove the `build-backend` key to allow for users to build extensions

PEP 517 changed how projects should define their build dependencies.
The presence of a `pyproject.toml` file changes the behavior of `pip` to
conform to PEP 517.
Since we haven't updated the `setup.py` file yet (I'm not even sure we're not
an edge case which would make it harder/impossible, I have not tried yet), this
is a workaround to issue6589: it allows users to pass `--no-use-pep517` to pip
to revert to the legacy installer. The build backend is simply assumed to be
the `build_meta:__legacy__` one.

Differential Revision: https://phab.mercurial-scm.org/D11393

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