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Rollup merge of #113715 - kadiwa4:lang_items_doc, r=JohnTitor

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Unstable Book: update `lang_items` page and split it

[`lang_items` rendered](https://github.com/kadiwa4/rust/blob/lang_items_doc/src/doc/unstable-book/src/language-features/lang-items.md), [`start` rendered](https://github.com/kadiwa4/rust/blob/lang_items_doc/src/doc/unstable-book/src/language-features/start.md)
Closes #110274
Rustonomicon PR: rust-lang/nomicon#413, Rust Book PR: rust-lang/book#3705

A lot of information doesn't belong on the `lang_items` page. I added a separate page for the `start` feature and moved some text into the Rustonomicon because the `lang_items` page should not be a tutorial on how to build a `#![no_std]` executable.
The list of existing lang items is too long/unstable, so I removed it.

The doctests still don't work. :(
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Josh Stone 2023-08-17 15:40:08 -07:00 • committed by GitHub
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2
compiler/rustc_error_codes/src/error_codes/E0132.md
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@ -13,7 +13,7 @@ It is not possible to declare type parameters on a function that has the `start`
attribute. Such a function must have the following type signature (for more
information, view [the unstable book][1]):
[1]: https://doc.rust-lang.org/unstable-book/language-features/lang-items.html#writing-an-executable-without-stdlib
[1]: https://doc.rust-lang.org/unstable-book/language-features/start.html
```
# let _:

4
compiler/rustc_error_codes/src/error_codes/E0152.md
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@ -20,6 +20,6 @@ attributes:
#![no_std]
```
See also the [unstable book][1].
See also [this section of the Rustonomicon][beneath std].
[1]: https://doc.rust-lang.org/unstable-book/language-features/lang-items.html#writing-an-executable-without-stdlib
[beneath std]: https://doc.rust-lang.org/nomicon/beneath-std.html