Polars 0.45.1 does not build on stable

[FHTMitchell]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

[package]
name = "polars-test"
version = "0.1.0"
edition = "2021"

[dependencies]
polars = { version = "0.45.1", default-features = false }  # "nightly" isn't a default feature but just to be clear

Log output

❯ cargo build --keep-going
   Compiling polars-row v0.45.1
   Compiling polars-parquet v0.45.1
error[E0658]: use of unstable library feature 'iter_repeat_n'
  --> /home/fmitchel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/polars-row-0.45.1/src/encode.rs:52:9
   |
52 |         std::iter::repeat_n(RowEncodingOptions::default(), columns.len())
   |         ^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #104434 <https://github.com/rust-lang/rust/issues/104434> for more information

error[E0658]: use of unstable library feature 'iter_repeat_n'
   --> /home/fmitchel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/polars-row-0.45.1/src/encode.rs:772:45
    |
772 | ...                   .extend(std::iter::repeat_n(masked_out_write_offset, length));
    |                               ^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #104434 <https://github.com/rust-lang/rust/issues/104434> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `polars-row` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
error[E0658]: use of unstable library feature 'is_none_or'
  --> /home/fmitchel/.cargo/registry/src/index.crates.io-6f17d22bba15001f/polars-parquet-0.45.1/src/arrow/read/deserialize/utils/mod.rs:45:45
   |
45 |         if is_optional && page.null_count().is_none_or(|nc| nc != 0) {
   |                                             ^^^^^^^^^^
   |
   = note: see issue #126383 <https://github.com/rust-lang/rust/issues/126383> for more information

error: could not compile `polars-parquet` (lib) due to 1 previous error

Issue description

Polars does not currently compile on the stable toolchain, despite the docs explicitly saying it should be possible.

Expected behavior

Polars compiles on stable.

Installed versions

None

[FHTMitchell]

Ah sorry I was running and old stable toolchain. Might be worth putting a MSRV in the readme? In any case, I'll close this issue.