Commits on May 20, 2023

1. Make <[T]>::array_* methods fail to compile on 0 len arrays …

   Methods updated:
   * `array_windows`
   * `array_chunks`
   * `array_chunks_mut`
   * `as_chunks`
   * `as_chunks_mut`
   * `as_chunks_unchecked`
   * `as_rchunks`
   * `as_rchunks_mut`
   * `as_chunks_unchecked_mut`
   
   I implemented this using compile time assertions.
   
   Example compilation error:
   
   ```
   > rustc +stage1 .\improper_array_windows.rs --crate-type=rlib
   error[E0080]: evaluation of `core::slice::<impl [u32]>::array_windows::<0>::{constant#0}` failed
       --> J:\rust_lang\library\core\src\slice\mod.rs:1381:13
        |
   1381 |             assert!(N != 0, "window size must be non-zero");
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked at 'window size must be non-zero', J:\rust_lang\library\core\src\slice\mod.rs:1381:13
        |
        = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `assert` (in Nightly builds, run with -Z macro-backtrace for more info)
   
   note: the above error was encountered while instantiating `fn core::slice::<impl [u32]>::array_windows::<0>`
    --> .\improper_array_windows.rs:4:14
     |
   4 |     for _ in s.array_windows::<0>(){
     |              ^^^^^^^^^^^^^^^^^^^^^^
   
   error: aborting due to previous error
   ```
   
   I also added doctests and adjusted documentation.
   
   Relates:
   rust-lang#74985
   rust-lang#75027

   

   AngelicosPhosphoros committed May 20, 2023
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