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as cast improvements #1732

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merged 4 commits into from
Feb 11, 2025
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WaffleLapkin
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Improve the description of as casts, see individual commits for more info.

`&m1 T -> *m2 T` is not specific to `as` casts (it's a coercion!), but
`*[T; N]` -> `*T` is! (previously only the reference source version was
documented)
@rustbot rustbot added the S-waiting-on-review Status: The marked PR is awaiting review from a maintainer label Feb 9, 2025
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WaffleLapkin commented Feb 9, 2025

Am I reading the CI failure correctly? It seems to imply that footnotes are global and you can't have [^1] in two different files. Why so?...

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ehuss commented Feb 9, 2025

Because all pages are concatenated together to generate the print page. mdbook currently doesn't have the ability to rewrite the markdown to make the footnotes unique.

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Looks good. Will merge with the footnote labels fixed (probably can pick some short words for those?).

I suppose eventually we should be a little clearer about the normative nature of whether or not a footnote counts.

apparently mdbook requires them to have globally unique identifiers
(but they are still rendered as ^1, ^2, ...)
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@ehuss fixed 👍🏻

@ehuss ehuss added this pull request to the merge queue Feb 11, 2025
Merged via the queue into rust-lang:master with commit 4d5e128 Feb 11, 2025
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@WaffleLapkin WaffleLapkin deleted the as-cast-improvements branch February 11, 2025 22:11
jhpratt added a commit to jhpratt/rust that referenced this pull request Feb 13, 2025
Update books

## rust-lang/book

1 commits in e2fa4316c5a7c0d2499c5d6b799adcfad6ef7a45..d4d2c18cbd20876b2130a546e790446a8444cb32
2025-02-12 16:22:54 UTC to 2025-02-12 16:22:54 UTC

- Fix example for `cargo fix` (rust-lang/book#4226)

## rust-lang/reference

3 commits in de2d5289e45506b11dd652bef4f99de64be70e1c..6195dbd70fc6f0980c314b4d23875ac570d8253a
2025-02-12 15:40:30 UTC to 2025-02-11 20:35:17 UTC

- Revert "Update function-pointer.md for stabilization of `extended_varargs_abi_support`" (rust-lang/reference#1734)
- Rework error handling in mdbook-spec (rust-lang/reference#1733)
- `as` cast improvements (rust-lang/reference#1732)
jhpratt added a commit to jhpratt/rust that referenced this pull request Feb 13, 2025
Update books

## rust-lang/book

1 commits in e2fa4316c5a7c0d2499c5d6b799adcfad6ef7a45..d4d2c18cbd20876b2130a546e790446a8444cb32
2025-02-12 16:22:54 UTC to 2025-02-12 16:22:54 UTC

- Fix example for `cargo fix` (rust-lang/book#4226)

## rust-lang/reference

3 commits in de2d5289e45506b11dd652bef4f99de64be70e1c..6195dbd70fc6f0980c314b4d23875ac570d8253a
2025-02-12 15:40:30 UTC to 2025-02-11 20:35:17 UTC

- Revert "Update function-pointer.md for stabilization of `extended_varargs_abi_support`" (rust-lang/reference#1734)
- Rework error handling in mdbook-spec (rust-lang/reference#1733)
- `as` cast improvements (rust-lang/reference#1732)
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Feb 13, 2025
Rollup merge of rust-lang#136937 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

1 commits in e2fa4316c5a7c0d2499c5d6b799adcfad6ef7a45..d4d2c18cbd20876b2130a546e790446a8444cb32
2025-02-12 16:22:54 UTC to 2025-02-12 16:22:54 UTC

- Fix example for `cargo fix` (rust-lang/book#4226)

## rust-lang/reference

3 commits in de2d5289e45506b11dd652bef4f99de64be70e1c..6195dbd70fc6f0980c314b4d23875ac570d8253a
2025-02-12 15:40:30 UTC to 2025-02-11 20:35:17 UTC

- Revert "Update function-pointer.md for stabilization of `extended_varargs_abi_support`" (rust-lang/reference#1734)
- Rework error handling in mdbook-spec (rust-lang/reference#1733)
- `as` cast improvements (rust-lang/reference#1732)
github-actions bot pushed a commit to rust-lang/miri that referenced this pull request Feb 15, 2025
Update books

## rust-lang/book

1 commits in e2fa4316c5a7c0d2499c5d6b799adcfad6ef7a45..d4d2c18cbd20876b2130a546e790446a8444cb32
2025-02-12 16:22:54 UTC to 2025-02-12 16:22:54 UTC

- Fix example for `cargo fix` (rust-lang/book#4226)

## rust-lang/reference

3 commits in de2d5289e45506b11dd652bef4f99de64be70e1c..6195dbd70fc6f0980c314b4d23875ac570d8253a
2025-02-12 15:40:30 UTC to 2025-02-11 20:35:17 UTC

- Revert "Update function-pointer.md for stabilization of `extended_varargs_abi_support`" (rust-lang/reference#1734)
- Rework error handling in mdbook-spec (rust-lang/reference#1733)
- `as` cast improvements (rust-lang/reference#1732)
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3 participants