outlines cannot install on Euler System

[Haoping-Xiao]

Describe the issue as clearly as possible:

fail to install outlines due to lack of rust complier.

system settings:

1. Python 3.9.10
2. cat /etc/os-release
   NAME="Huawei Cloud EulerOS"
   VERSION="2.0 (aarch64)"
   ID="hce"
   VERSION_ID="2.0"
   PRETTY_NAME="Huawei Cloud EulerOS 2.0 (aarch64)"
   ANSI_COLOR="0;31"
3. pip 21.0.1

Steps/code to reproduce the bug:

pip install outlines

Expected result:

pip install successfully

Error message:

ERROR: Command errored out with exit status 1:
   command: /home/ma-user/anaconda3/envs/PyTorch-2.1.0/bin/python3.9 /home/ma-user/anaconda3/envs/PyTorch-2.1.0/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmp8nq3jjt5
       cwd: /tmp/pip-install-9x2lsc1s/outlines-core_ff40362b30294fdbb665f7cf889d3f96
  Complete output (76 lines):
  running bdist_wheel
  running build
  running build_py
  creating build/lib.linux-aarch64-cpython-39/outlines_core
  copying python/outlines_core/_version.py -> build/lib.linux-aarch64-cpython-39/outlines_core
  copying python/outlines_core/__init__.py -> build/lib.linux-aarch64-cpython-39/outlines_core
  running egg_info
  writing python/outlines_core.egg-info/PKG-INFO
  writing dependency_links to python/outlines_core.egg-info/dependency_links.txt
  writing requirements to python/outlines_core.egg-info/requires.txt
  writing top-level names to python/outlines_core.egg-info/top_level.txt
  ERROR setuptools_scm._file_finders.git listing git files failed - pretending there aren't any
  reading manifest file 'python/outlines_core.egg-info/SOURCES.txt'
  adding license file 'LICENSE'
  writing manifest file 'python/outlines_core.egg-info/SOURCES.txt'
  /tmp/pip-build-env-a1cv_pv1/overlay/lib/python3.9/site-packages/setuptools/command/build_py.py:212: _Warning: Package 'outlines_core.fsm' is absent from the `packages` configuration.
  !!
  
          ********************************************************************************
          ############################
          # Package would be ignored #
          ############################
          Python recognizes 'outlines_core.fsm' as an importable package[^1],
          but it is absent from setuptools' `packages` configuration.
  
          This leads to an ambiguous overall configuration. If you want to distribute this
          package, please make sure that 'outlines_core.fsm' is explicitly added
          to the `packages` configuration field.
  
          Alternatively, you can also rely on setuptools' discovery methods
          (for example by using `find_namespace_packages(...)`/`find_namespace:`
          instead of `find_packages(...)`/`find:`).
  
          You can read more about "package discovery" on setuptools documentation page:
  
          - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html
  
          If you don't want 'outlines_core.fsm' to be distributed and are
          already explicitly excluding 'outlines_core.fsm' via
          `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
          you can try to use `exclude_package_data`, or `include-package-data=False` in
          combination with a more fine grained `package-data` configuration.
  
          You can read more about "package data files" on setuptools documentation page:
  
          - https://setuptools.pypa.io/en/latest/userguide/datafiles.html
  
  
          [^1]: For Python, any directory (with suitable naming) can be imported,
                even if it does not contain any `.py` files.
                On the other hand, currently there is no concept of package data
                directory, all directories are treated like packages.
          ********************************************************************************
  
  !!
    check.warn(importable)
  copying python/outlines_core/py.typed -> build/lib.linux-aarch64-cpython-39/outlines_core
  creating build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  copying python/outlines_core/fsm/__init__.py -> build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  copying python/outlines_core/fsm/guide.py -> build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  copying python/outlines_core/fsm/json_schema.py -> build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  copying python/outlines_core/fsm/outlines_core_rs.pyi -> build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  copying python/outlines_core/fsm/regex.py -> build/lib.linux-aarch64-cpython-39/outlines_core/fsm
  running build_ext
  running build_rust
  error: can't find Rust compiler
  
  If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
  
  To update pip, run:
  
      pip install --upgrade pip
  
  and then retry package installation.
  
  If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.
  ----------------------------------------
  ERROR: Failed building wheel for outlines-core
Failed to build outlines-core
ERROR: Could not build wheels for outlines-core which use PEP 517 and cannot be installed directly

Outlines/Python version information:

Version information

``` Python 3.9.10 | packaged by conda-forge | (main, Feb 1 2022, 21:53:27) [GCC 9.4.0] ```

Context for the issue:

The latest outlines and outlines-core doesn't work.