Caused by: Failed to build a native library through cargo

[reallyusefulengine]

Im following the book refactoring to rust which uses maturin.

When i create a virtual env and activate and run the following command I get an error:

py_rust % maturin develop
🔗 Found pyo3 bindings
🐍 Found CPython 3.9 at /Users/johnwilliams/.local/share/virtualenvs/py_rust-QUdKXKyu/bin/python
💥 maturin failed
  Caused by: Failed to build a native library through cargo

im using an m1 mac and my folder structure looks like this:

Any help would be appreciated to get me blocked.

[messense]

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#1019 (comment)