README example does not compile

[nils-werner]

I'm trying to compile the README example, but I'm stubling across this error during compilation, and I'm not familiar enough with Rust to understand what exactly is going wrong. snd.read_all_to_ndarray().unwrap() returns an ArrayBase<OwnedRepr<_>, Dim<[usize; 2]>> instead of an ArrayBase<OwnedRepr<f32>, Dim<[usize; 2]>>, but I'm not sure why the compiler can't pick the right impl for this...

error[E0308]: mismatched types
    --> src/main.rs:9:36
     |
9    |   let data: ndarray::Array2<f32> = snd.read_all_to_ndarray().unwrap();
     |             --------------------   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `ArrayBase<OwnedRepr<f32>, Dim<[usize; 2]>>`, found `ArrayBase<OwnedRepr<_>, Dim<[usize; 2]>>`
     |             |
     |             expected due to this
     |
     = note: `ArrayBase<OwnedRepr<_>, Dim<[usize; 2]>>` and `ArrayBase<OwnedRepr<f32>, Dim<[usize; 2]>>` have similar names, but are actually distinct types
note: `ArrayBase<OwnedRepr<_>, Dim<[usize; 2]>>` is defined in crate `ndarray`
    --> /home/nils/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ndarray-0.13.1/src/lib.rs:1221:1
     |
1221 | pub struct ArrayBase<S, D>
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
note: `ArrayBase<OwnedRepr<f32>, Dim<[usize; 2]>>` is defined in crate `ndarray`
    --> /home/nils/.cargo/registry/src/index.crates.io-6f17d22bba15001f/ndarray-0.15.6/src/lib.rs:1268:1
     |
1268 | pub struct ArrayBase<S, D>
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
     = note: perhaps two different versions of crate `ndarray` are being used?

For more information about this error, try `rustc --explain E0308`.
error: could not compile `dsptest` (bin "dsptest") due to previous error

I'm running

rustc 1.71.0 (8ede3aae2 2023-07-12)
cargo 1.71.0 (cfd3bbd8f 2023-06-08)
ndarray v0.15.6
sndfile v0.1.1

[nils-werner]

Actually, the reason is that I have two different versions of ndarray installed:

├── ndarray v0.15.6
└── sndfile v0.1.1
    └── ndarray v0.13.1

I had to restrict the outer ndarray to a version compatible to 0.13, so that cargo could match the two:

cargo add ndarray@^0.13