maturin 1.5 as backend breaks poetry add

[brettc]

Bug Description

poetry (and perhaps others not tested) cannot install a package that has maturin 1.5 as a backend.

So, with this in my pyproject.toml, I cannot install the package, as it selects maturin 1.5. Poetry reports:
Unable to create package with no name

[build-system]
requires = ["maturin>=1.2,<2.0"]
build-backend = "maturin"

If I change it this line, it works:
requires = ["maturin>=1.2,<1.5"]

Your maturin version (maturin --version)

1.5

Your Python version (python -V)

3.12.2

Your pip version (pip -V)

23.3.2

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

If on windows, have you checked that you aren't accidentally using unix path (those with the forward slash /)?

• Yes

Steps to Reproduce

Make sure you have the latest poetry and rye installed.
Do this in a shell:

# create a python and a python/maturin project
poetry new snake
rye init oxide --build-system maturin

# add the maturin project as a dependency
cd snake
poetry add ../oxide

# Fail

To fix it, change the line ["maturin>=1.2,<1.5"]
Now the poetry add will work.

[messense]

Probably because Poetry doesn't support metadata 2.3?

[konstin]

Fixed upstream in python-poetry/poetry#9130