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Update books
## reference
2 commits in a92be0fef439b3d8e0468d82cb24812d303520a0..f3d3953bf3b158d596c96d55ce5366f9f3f972e9
2022-07-21 19:01:23 -0700 to 2022-08-01 17:17:37 -0700
- Add `let_chains` references (rust-lang/reference#1179)
- Remove outdated warning (rust-lang/reference#1243)
## rust-by-example
18 commits in 3155db49b0d57cd82c65456ac210b69ecec5ccb1..ee342dc91e1ba1bb1e1f1318f84bbe3bfac04798
2022-07-05 20:35:53 -0300 to 2022-07-27 11:06:36 -0300
- Closure inferred twice (rust-lang/rust-by-example#1588)
- fix a syntax bug in example assembly (rust-lang/rust-by-example#1511)
- Minor grammar change in src/std/rc.md paragraph 2 (rust-lang/rust-by-example#1586)
- Fix typo in asm.md (rust-lang/rust-by-example#1585)
- Fix incorrect padding in fixed-width print (rust-lang/rust-by-example#1584)
- Update print.md (rust-lang/rust-by-example#1582)
- add-chapter-on-defaults (rust-lang/rust-by-example#1580)
- Fix typo (rust-lang/rust-by-example#1579)
- fix a compile error (rust-lang/rust-by-example#1578)
- Suggest using mod.rs pattern to share test code (rust-lang/rust-by-example#1577)
- fix a compile error in iter_any.md (rust-lang/rust-by-example#1576)
- Mention attribute like macros in attributes.md (rust-lang/rust-by-example#1574)
- Update exercise to be clearer (rust-lang/rust-by-example#1573)
- fixes link for turbofish in testcase_mapreduce.md (rust-lang/rust-by-example#1572)
- Fix inconsistency between comment and code in hello/print.md (rust-lang/rust-by-example#1571)
- Fixes a typo in print.md (rust-lang/rust-by-example#1570)
- into_iter-moves-elements (rust-lang/rust-by-example#1569)
- Fix a typo in print.md (rust-lang/rust-by-example#1568)
## rustc-dev-guide
16 commits in d5201cddace979b299ec1bf9fd8997338151aa9d..04f3cf0bb2f5a6ee2bfc4b1a6a6cd8c11d1c5531
2022-07-21 04:48:49 +0200 to 2022-07-31 07:46:57 +0200
- address review comment
- accept review suggestion
- try address review comments
- summary of chapter
- Update src/building/compiler-documenting.md
- revamp doc-build chapter
- minor fixes
- Prefer relative links
- Fix the link to clippy docs
- Fix the link to `ResolverAstLowering`
- Fix the link to `ProcMacro` trait
- Fix the link to `Lazy<T>`
- Add instructions to fix build errors in std after adding a new target
- Document how to build a cross-compiler
- Add documentation about Microsoft provided debuggers and CodeView/PDB… (rust-lang/rustc-dev-guide#1406)
- rust-analyzer is now a subtree
## embedded-book
2 commits in 766979590da8100998f0d662499d4a901d8d1640..befe6840874311635c417cf731377f07234ee373
2022-07-04 09:13:58 +0000 to 2022-07-25 07:51:14 +0000
- Updated instructions for running first Hardware example (rust-embedded/book#323)
- Improved ligability for hardware.md (rust-embedded/book#324)
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Update rustc man page to match `rustc --help`
This brings the `--crate-type`, `--emit`, and `--print` options' allowed arguments into sync with that printed by `rustc --help`.
c.f. the `opt::multi_s` calls for `"crate-type"`, `"emit"`, and `"print"` here: https://github.com/rust-lang/rust/blob/master/compiler/rustc_session/src/config.rs
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Use Parser's `restrictions` instead of `let_expr_allowed`
This also means that the `ALLOW_LET` flag is reset properly for subexpressions, so we can properly deny things like `a && (b && let c = d)`. Also the parser is a tiny bit smaller now.
It doesn't reject _all_ bad `let` expr usages, just a bit more.
cc `@c410-f3r`
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r=notriddle
Fix item info pos and height
Fixes https://github.com/rust-lang/rust/issues/98266.
Fixes https://github.com/rust-lang/rust/issues/98343.
You can test it [here](https://rustdoc.crud.net/imperio/fix-item-info-pos-and-height/lib2/trait.Trait.html).
Here is a screenshot of the result:
r? `@jsha`
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only run --all-targets in stage0 for Std
Repro'd the issue with `python3 x.py check --stage 1 library/std` and tested the fix with the same command.
r? `@jyn514`
I tried to implement [this solution](https://github.com/rust-lang/rust/issues/98720#issuecomment-1184435462), but didn't have any luck. I don't think I fully understood what needed to be done. However, I would love to be mentored on it since it would be a more correct solution, and I can learn more about how bootstrap works.
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Don't cancel try-perf branch if 'outdated'
`try-perf` just like the `try` branch should always run all jobs to completion. This allows us to use the branch like a queue.
r? `@Mark-Simulacrum`
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This brings the `--crate-type`, `--emit`, and `--print` options' allowed arguments into sync with that printed by `rustc --help`.
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Thin `AssocItem`
This PR removes a few fields from `AssocItem` that should be easily computed using other queries.
This simplifies some of the metadata decoding.
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Add tests for raw-dylib with vectorcall, and fix vectorcall code generation
* Adds tests for using `raw-dylib` (#58713) with `vectorcall`.
* Fixed code generation for `vectorcall` (parameters have to be marked with `InReg`, just like `fastcall`).
* Enabled running the `raw-dylib` `fastcall` tests when using MSVC (since I had to add support in the test for running MSVC-only tests since GCC doesn't support `vectorcall`).
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Rollup of 8 pull requests
Successful merges:
- #99340 (Fix ICE in Definitions::create_def)
- #99629 (Improve `cannot move out of` error message)
- #99864 (bootstrap: don't emit warn about duplicated deps with same/different features if some of sets actually empty)
- #99911 (Remove some uses of `guess_head_span`)
- #99976 (Make Rustdoc exit with correct error code when scraping examples from invalid files)
- #100003 (Improve size assertions.)
- #100012 (Avoid `Ty` to `String` conversions)
- #100020 (better error when python is not found in x - issue #99648)
Failed merges:
- #99994 (Replace `guess_head_span` with `opt_span`)
r? `@ghost`
`@rustbot` modify labels: rollup
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better error when python is not found in x - issue #99648
`x` now shows an appropriate error message and exits, when a version of `python` is not found on the users `PATH`.
Resolves #99648
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Improve size assertions.
- For any file with four or more size assertions, move them into a
separate module (as is already done for `hir.rs`).
- Add some more for AST nodes and THIR nodes.
- Put the `hir.rs` ones in alphabetical order.
r? `@lqd`
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Make Rustdoc exit with correct error code when scraping examples from invalid files
This PR fixes a small issue with the new Rustdoc scrape-examples feature. If a file that is being scraped has a type error, then currently that error is printed out, but the rustdoc process exits as if it succeeded. This is a problem for Cargo, which needs to track whether scraping succeeded (see rust-lang/cargo#10343).
This PR fixes the issue by checking whether an error is emitted, and aborting if so.
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Remove some uses of `guess_head_span`
That function cuts a span at the first occurrence of `{`. Using `def_span` is almost always more precise.
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bootstrap: don't emit warn about duplicated deps with same/different features if some of sets actually empty
Example (https://github.com/rust-lang-ci/rust/runs/7551453940?check_suite_focus=true#step:25:15008):
```
duplicate artifacts found when compiling a tool, this typically means that something was recompiled because a transitive dependency has different features activated than in a previous build:
the following dependencies are duplicated although they have the same features enabled:
the following dependencies have different features:
memchr 2.5.0 (registry+https://github.com/rust-lang/crates.io-index)
`clippy-driver` additionally enabled features {} at "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-freebsd/release/deps/libmemchr-44aa6ff4f08e293f.rlib"
`cargo` additionally enabled features {"use_std"} at "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-freebsd/release/deps/libmemchr-70e29af0fd3ef292.rlib"
```
Notice that no info printed under `the following dependencies are duplicated although they have the same features enabled:`
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Improve `cannot move out of` error message
Closes #99470
r? `@bjorn3`
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Lexer improvements
Some cleanups and small speed improvements.
r? `@matklad`
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chore: clean comments to be relevant
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files
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Limit symbols exported from proc macros
Only `__rustc_proc_macro_decls_*__` and `rust_metadata_*` need to be
exported for proc macros to work. All other symbols only increase binary
size and have the potential to conflict with symbols from the host
compiler.
Fixes https://github.com/rust-lang/rust/issues/99909
Fixes #59998
cc `@eddyb`
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Rollup of 7 pull requests
Successful merges:
- #99519 (Remove implicit names and values from `--cfg` in `--check-cfg`)
- #99620 (`-Z location-detail`: provide option to disable all location details)
- #99932 (Fix unwinding on certain platforms when debug assertions are enabled)
- #99973 (Layout things)
- #99980 (Remove more Clean trait implementations)
- #99984 (Fix compat.rs for `cfg(miri)`)
- #99986 (Add wrap suggestions for record variants)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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- For any file with four or more size assertions, move them into a
separate module (as is already done for `hir.rs`).
- Add some more for AST nodes and THIR nodes.
- Put the `hir.rs` ones in alphabetical order.
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From 72 bytes to 12 bytes (on x86-64).
There are two parts to this:
- Changing various source code offsets from 64-bit to 32-bit. This is
not a problem because the rest of rustc also uses 32-bit source code
offsets. This means `Token` is no longer `Copy` but this causes no
problems.
- Removing the `RawStrError` from `LiteralKind`. Raw string literal
invalidity is now indicated by a `None` value within
`RawStr`/`RawByteStr`, and the new `validate_raw_str` function can be
used to re-lex an invalid raw string literal to get the `RawStrError`.
There is one very small change in behaviour. Previously, if a raw string
literal matched both the `InvalidStarter` and `TooManyHashes` cases,
the latter would override the former. This has now changed, because
`raw_double_quoted_string` now uses `?` and so returns immediately upon
detecting the `InvalidStarter` case. I think this is a slight
improvement to report the earlier-detected error, and it explains the
change in the `test_too_many_hashes` test.
The commit also removes a couple of comments that refer to #77629 and
say that the size of these types don't affect performance. These
comments are wrong, though the performance effect is small.
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r=compiler-errors
Add wrap suggestions for record variants
This PR adds a suggestions to wrap an expression in a record struct/variant when encountering mismatched types, similarly to a suggestion to wrap expression in a tuple struct that was added before.
An example:
```rust
struct B {
f: u8,
}
enum E {
A(u32),
B { f: u8 },
}
fn main() {
let _: B = 1;
let _: E = 1;
}
```
```text
error[E0308]: mismatched types
--> ./t.rs:11:16
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11 | let _: B = 1;
| - ^ expected struct `B`, found integer
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help: try wrapping the expression in `B`
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11 | let _: B = B { f: 1 };
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error[E0308]: mismatched types
--> ./t.rs:12:16
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12 | let _: E = 1;
| - ^ expected enum `E`, found integer
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| expected due to this
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help: try wrapping the expression in a variant of `E`
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12 | let _: E = E::A(1);
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12 | let _: E = E::B { f: 1 };
| +++++++++ +
```
r? `@compiler-errors`
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Remove more Clean trait implementations
This time as well it allowed to remove a function.
Follow-up of https://github.com/rust-lang/rust/pull/99638.
r? `@notriddle`
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Layout things
These two commits are pretty independent, but didn't seem worth doing individual PRs for:
- Always check that size is a multiple of align, even without debug assertions
- Change Layout debug printing to put `variants` last, since it often huge and not usually the part we are most interested in
Cc `@eddyb`
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`-Z location-detail`: provide option to disable all location details
As reported [here](https://github.com/rust-lang/rust/pull/89920#issuecomment-1190598924), when I first implemented the `-Z location-detail` flag there was a bug, where passing an empty list was not correctly supported, and instead rejected by the compiler. This PR fixes that such that passing an empty list results in no location details being tracked, as originally specified in https://github.com/rust-lang/rfcs/pull/2091 .
This PR also adds a test case to verify that this option continues to work as intended.
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Remove implicit names and values from `--cfg` in `--check-cfg`
This PR remove the implicit names and values from `--cfg` in `--check-cfg` because the behavior is quite surprising but also because it's really easy to inadvertently really on the implicitness and when the `--cfg` is not set anymore to have an unexpected warning from an unexpected condition that pass with the implicitness.
This change in behavior will also enable us to warn when an unexpected `--cfg` is passed, ex: the user wrote `--cfg=unstabl` instead of `--cfg=unstable`. The implementation of the warning will be done in a follow-up PR.
cc `@petrochenkov`
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TaKO8Ki:suggest-removing-semicolon-and-boxing-the-expressions, r=compiler-errors
Suggest removing a semicolon and boxing the expressions for if-else
`InferCtxt::suggest_remove_semi_or_return_binding` was not working well, so I fixed it and added a ui test.
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Use `impl`'s generics when suggesting fix on bad `impl Copy`
See the UI test for a more complicated example, but we weren't correctly suggesting to add bounds given a manual `impl` whose generics didn't match the struct generics.
```rust
#[derive(Clone)]
struct Wrapper<T>(T);
impl<S> Copy for Wrapper<S> {}
```
Coincidentally this fix didn't cause any regressions for `derive(Copy)` impls, I think because those use the same spans in the impl generics as the struct generics, so the machinery still applies the same change.
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Use LocalDefId for closures more
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