Rollup of 9 pull requests #80867
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Rollup of 9 pull requests #80867
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The size assertion in the comment was inverted compared to the code. After fixing that the implication that `(new_size >= old_size) => new_size != 0` still doesn't hold so explain why `old_size != 0` at this point.
On structured suggestion for `let` -> `const` and `const` -> `let`, use a proper `Span` and update tests to check the correct application. Follow up to rust-lang#80012.
It was only used once, in a function that was otherwise trivial.
In particular, the CI built `libLLVM-*.so` needs to have `libz.so` RPATHed so that binaries like `llvm-config` work at all.
This makes it possible to have both std::panic and core::panic as a builtin macro, by using different builtin macro names for each. Also removes SyntaxExtension::is_derive_copy, as the macro name (e.g. sym::Copy) is now tracked and provides that information directly.
This used to be necessary for `is_builtin` in the past, but is no longer required. Co-authored-by: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Hopefully this will prevent people from continuing to ask about this over and over again :) See [this Zulip discussion][1] for more. [1]: https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Vec.3A.3Atruncate.20implementation
…u64, r=withoutboats
Implement From<char> for u64 and u128.
With this PR you can write
```
let u = u64::from('👤');
let u = u128::from('👤');
```
Previously, you could already write `as` conversions ([Playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=cee18febe28e69024357d099f07ca081)):
```
// Lossless conversions
dbg!('👤' as u32); // Prints 128100
dbg!('👤' as u64); // Prints 128100
dbg!('👤' as u128); // Prints 128100
// truncates, thus no `From` impls.
dbg!('👤' as u8); // Prints 100
dbg!('👤' as u16); // Prints 62564
// These `From` impls already exist.
dbg!(u32::from('👤')); // Prints 128100
dbg!(u64::from(u32::from('👤'))); // Prints 128100
```
The idea is from ``@gendx`` who opened [this Internals thread](https://internals.rust-lang.org/t/implement-from-char-for-u64/13454), and ``@withoutboats`` responded that someone should open a PR for it.
Some people mentioned `From<char>` impls for `f32` and `f64`, but that doesn't seem correct to me, so I didn't include them here.
I don't know what the feature should be named. Must it be registered somewhere, like unstable features?
r? ``@withoutboats``
…r=matthewjasper
Improve core::ptr::drop_in_place debuginfo
* Use span of the dropped type as function span when possible.
* Rename symbol from `core::ptr::drop_in_place::$hash` to `{{drop}}::<$TYPE>::$hash`.
Fixes rust-lang#77465
(I haven't yet updated the tests)
Fix safety comment The size assertion in the comment was inverted compared to the code. After fixing that the implication that `(new_size >= old_size) => new_size != 0` still doesn't hold so explain why `old_size != 0` at this point.
… r=petrochenkov Use correct span for structured suggestion On structured suggestion for `let` -> `const` and `const` -> `let`, use a proper `Span` and update tests to check the correct application. Follow up to rust-lang#80012.
…Gomez Remove useless `fill_in` function It was only used once, in a function that was otherwise trivial.
…ulacrum Support `download-ci-llvm` on NixOS In particular, the CI built `libLLVM-*.so` needs to have `libz.so` RPATHed so that binaries like `llvm-config` work at all.
…repetita, r=jyn514 Remove under-used ImplPolarity enum It doesn't make much sense to have an enum with only two possible values and to store it inside an `Option` in my opinion when you can do all the same with a simple boolean. I don't expect any chances, performance or RSS usage wise. r? ``@jyn514``
…=petrochenkov Allow #[rustc_builtin_macro = "name"] This adds the option of specifying the name of a builtin macro in the `#[rustc_builtin_macro]` attribute: `#[rustc_builtin_macro = "name"]`. This makes it possible to have both `std::panic!` and `core::panic!` as a builtin macro, by using different builtin macro names for each. This is needed to implement the edition-specific behaviour of the panic macros of RFC 3007. Also removes `SyntaxExtension::is_derive_copy`, as the macro name (e.g. `sym::Copy`) is now tracked and provides that information directly. r? ``@petrochenkov``
…ttmcm Add comment to `Vec::truncate` explaining `>` vs `>=` Hopefully this will prevent people from continuing to ask about this over and over again :) See [this Zulip discussion][1] for more. [1]: https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Vec.3A.3Atruncate.20implementation r? ``@scottmcm``
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@bors r+ p=9 rollup=never |
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📌 Commit 19b8c65 has been approved by |
bors
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☀️ Test successful - checks-actions |
This was referenced Jan 10, 2021
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Successful merges:
fill_infunction #80803 (Remove uselessfill_infunction)download-ci-llvmon NixOS #80820 (Supportdownload-ci-llvmon NixOS)Vec::truncateexplaining>vs>=#80857 (Add comment toVec::truncateexplaining>vs>=)Failed merges:
r? @ghost
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