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Rollup of 10 pull requests - #73115
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Incremental compilation needs to be turned off. Also added the other RUSTFLAGS that should/need to be turned on.
Fix suggestions from review. Co-authored-by: Bastian Kauschke <bastian_kauschke@hotmail.de>
The other blocks depends on Deref to make it easier for readers when reimplementing or reading the implementations.
There are two separate `impl<T, Global>` which no special reason, it would be better to merge both of them.
- mention `--target` flag excludes RUSTFLAGS passing to build scripts and proc macros
Currently, the `Debug` impl for `proc_macro::Span` just prints out the byte range. This can make debugging proc macros (either as a crate author or as a compiler developer) very frustrating, since neither the actual filename nor the `SyntaxContext` is displayed. This commit adds a perma-unstable flag `-Z span-debug`. When enabled, the `Debug` impl for `proc_macro::Span` simply forwards directly to `rustc_span::Span`. Once rust-lang#72618 is merged, this will start displaying actual line numbers. While `Debug` impls are not subject to Rust's normal stability guarnatees, we probably shouldn't expose any additional information on stable until `#![feature(proc_macro_span)]` is stabilized. Otherwise, we would be providing a 'backdoor' way to access information that's supposed be behind unstable APIs.
When creating default values a trait method needs to be called with an explicit trait name. `Default::default()` seems redundant. A free function on the other hand, when imported directly, seems to be a better API, as it is just `default()`. When implementing the trait, a method is still required.
Update annotate-snippets-rs to 0.8.0 rust-lang#59346 I made major changes to this library. In the previous version we worked with owned while in the current one with borrowed. I have adapted it without changing the behavior. I have modified the coverage since the previous one did not return correctly the index of the character in the line.
impl AsRef<[T]> for vec::IntoIter<T> Adds `impl<T> AsRef<[T]> for vec::IntoIter<T>`. This mirrors the same trait impl for [`slice::Iter`](https://doc.rust-lang.org/nightly/std/slice/struct.Iter.html). Both types already offer `fn as_slice(&self) -> &[T]`, this just adds the trait impl for `vec::IntoIter`. If/when `fn as_slice(&self) -> &[T]` stabilizes for `vec::Drain` and `slice::IterMut`, they should get `AsRef<[T]>` impls as well. As thus, tangentially related to rust-lang#58957. My ultimate goal here: being able to use `for<T, I: Iterator<Item=T> + AsRef<[T]>> I` to refer to `vec::IntoIter`, `vec::Drain`, and eventually `array::IntoIter`, as an approximation of the set of by-value iterators that can be "previewed" as by-ref iterators. (Actually expressing that as a trait requires GAT.)
…r=steveklabnik Fix documentation example for gcov profiling closesrust-lang#72546 Improves the documentation for the unstable Rustflag `-Zprofile` by: - stating that Incremental compilation must be turned off. - Adding the other `RUSTFLAGS` that should/need to be turned on (taken from [grcov documentation](https://github.com/mozilla/grcov#example-how-to-generate-gcda-files-for-a-rust-project)) - Mentioning `RUSTC_WRAPPER` to prevent everything getting instrumented. r? @steveklabnik
…an-DPC Added the documentation for the 'use' keyword This is a partial fix of rust-lang#34601. I heavily inspired myself from the Reference on the `use` keyword. I checked the links when compiling the documentation, they should be ok. I also added an example for the wildcard `*` in the case of types, because it's behaviour is not *import everything* like one might think at first.
…rochenkov Add `-Z span-debug` to allow for easier debugging of proc macros Currently, the `Debug` impl for `proc_macro::Span` just prints out the byte range. This can make debugging proc macros (either as a crate author or as a compiler developer) very frustrating, since neither the actual filename nor the `SyntaxContext` is displayed. This commit adds a perma-unstable flag `-Z span-debug`. When enabled, the `Debug` impl for `proc_macro::Span` simply forwards directly to `rustc_span::Span`. Once rust-lang#72618 is merged, this will start displaying actual line numbers. While `Debug` impls are not subject to Rust's normal stability guarnatees, we probably shouldn't expose any additional information on stable until `#![feature(proc_macro_span)]` is stabilized. Otherwise, we would be providing a 'backdoor' way to access information that's supposed be behind unstable APIs.
Liballoc impl Mainly code rearrangements
…olnay Cstring `from_raw` and `into_raw` safety precisions Fixesrust-lang#48525. Fixesrust-lang#68456. This issue had two points: - The one about `from_raw` has been addressed (I hope). - The other one, about `into_raw`, has only been partially fixed. About `into_raw`: the idea was to: > steer users away from using the pattern of CString::{into_raw,from_raw} when interfacing with C APIs that may change the effective length of the string by writing interior NULs or erasing the final NUL I tried making a `Vec<c_char>` like suggested but my current solution feels very unsafe and *hacky* to me (most notably the type cast), I included it here to make it available for discussion: ```rust fn main() { use std::os::raw::c_char; let v = String::from("abc") .bytes() // From u8 to i8, // I feel like it will be a problem for values of u8 > 255 .map(|c| c as c_char) .collect::<Vec<_>>(); dbg!(v); } ```
Free `default()` forwarding to `Default::default()` It feels a bit redundant to have to say `Default::default()` every time I need a new value of a type that has a `Default` instance. Especially so, compared to Haskell, where the same functionality is called `def`. Providing a free `default()` function that forwards to `Default::default()` seems to improve the situation. The trait is still there, so if someone wants to be explicit and to say `Default::default()` - it still works, but if imported as `std::default::default;`, then the free function reduces typing and visual noise.
Add comments to `Resolve::get_module` r? @Manishearth
…an-DPC Clean up E0646 r? @Dylan-DPC
RalfJung
commented
Jun 8, 2020
MemberAuthor
bors
commented
Jun 8, 2020
Collaborator
📌 Commit 7983e56 has been approved by |
bors
commented
Jun 8, 2020
Collaborator
⌛ Testing commit 7983e56 with merge 6e18df9d01e21805b9922ecbac6c6e52d9fa3634... |
bors
commented
Jun 8, 2020
Collaborator
💥 Test timed out |
Dylan-DPC-zz
commented
Jun 8, 2020
@bors retry |
MemberAuthor
Cc @rust-lang/infra second timeout I am seeing in 24h... (the other one is #72904 (comment)) |
bors
commented
Jun 8, 2020
Collaborator
⌛ Testing commit 7983e56 with merge bf2f79e6554e9a4b8e05e572b2f821a5dc48e71d... |
marmeladema
commented
Jun 8, 2020
Contributor
FYI, it was making progress, albeit rather slowly: https://dev.azure.com/rust-lang/rust/_build/results?buildId=31399&view=logs&j=fd0bd97c-dca3-5d16-5976-7c3893e4446f&t=3fc0f2c0-6393-5fc1-7bce-c70c707d4d26 |
Dylan-DPC-zz
commented
Jun 8, 2020
looks like one of the normal failures we receive once in a while |
marmeladema
commented
Jun 8, 2020
Contributor
All builds have finished except https://dev.azure.com/rust-lang/rust/_build/results?buildId=31422&view=logs&j=77fe58e7-c26b-56af-861c-0e6795721952&t=28b6fc66-4f34-5b10-ad6a-df15d8bbc116 which seems blocked on completion. |
RalfJung
commented
Jun 8, 2020
MemberAuthor
Strange, it said "Build completed successfully in 2:13:42" already more than 1h ago, and then stopped. |
looks like another timeout.. (normal merge takes 3h 15 mins approx) |
bors
commented
Jun 8, 2020
Collaborator
💥 Test timed out |
RalfJung
commented
Jun 8, 2020
MemberAuthor
There we go. |
bors
commented
Jun 8, 2020
Collaborator
bors
commented
Jun 8, 2020
Collaborator
☀️ Test successful - checks-azure |
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Successful merges:
-Z span-debugto allow for easier debugging of proc macros #72799 (Add-Z span-debugto allow for easier debugging of proc macros)from_rawandinto_rawsafety precisions #72963 (Cstringfrom_rawandinto_rawsafety precisions)default()forwarding toDefault::default()#73001 (Freedefault()forwarding toDefault::default())Resolve::get_module#73075 (Add comments toResolve::get_module)Failed merges:
r? @ghost