FIX - Char documentation for unexperienced users
This is my first PR on rust and even if I've read [CONTRIBUTING.md](https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#pull-requests) I'm ensure everything is perfect. Sorry if I didn't follow the exact procedure.
**What it does:**
- Add an example in the char documentation
**Explanation**
Unexperienced users might not know that punctuation is `Case_Ignorable` and not `Uppercase` and `Lowercase` which mean that when checking if a string is uppercase one might be tempted to write:
```rust
my_string.chars().all(char::is_uppercase)
```
However this will return false for `"HELLO WORLD"` which is not intuitive. Since the function `is_case_ignorable` doesn't exists I believe the correct way to check is:
```rust
!my_string.chars().any(char::is_lowercase)
```
The aim of this example is to prevent unexperienced users to make an error which punctuation chars.
Suggest installing VS Build Tools in more situations
When MSVC's `link.exe` wasn't found but another `link.exe` was, the error message given can be [impenetrable](https://pastebin.com/MRMCr7HM) to many users. The usual suspect is GNU's `link` tool. In this case, inform the user that they may need to install VS build tools.
This only applies when Microsoft's link tool is expected.
Fix going back in history to a search result page on firefox
This bug was actually firefox not re-running JS script when you go back in history. To trigger it on the current docs:
* Make a search
* Pick an element (which isn't on the same page as the current element!)
* Go back in history
Instead of having the search results, you'll see the normal doc page. You can find a small explanation about it [here](http://web.archive.org/web/20100428053932/http://www.firefoxanswer.com/firefox/672-firefoxanswer.html).
r? @kinnison
cc @ollie27
Dumb NRVO
This is a very simple version of an NRVO pass, which scans backwards from the `return` terminator to see if there is an an assignment like `_0 = _1`. If a basic block with two or more predecessors is encountered during this scan without first seeing an assignment to the return place, we bail out. This avoids running a full "reaching definitions" dataflow analysis.
I wanted to see how much `rustc` would benefit from even a very limited version of this optimization. We should be able to use this as a point of comparison for more advanced versions that are based on live ranges.
r? @ghost
Use `T`'s discriminant type in `mem::Discriminant<T>` instead of `u64`.
fixes#70509
Adds the lang-item `discriminant_kind`.
Updates the function signature of `intrinsics::discriminant_value`.
Adds the *probably permanently unstable* trait `DiscriminantKind`.
`mem::Discriminant` should now be smaller in some cases.
r? @ghost
For running the compiler, we usually only need LLVM from `$sysroot/lib`,
which rustup will make available with `LD_LIBRARY_PATH`. We've also been
shipping LLVM in the `$target/lib` directory, which bloats the download
and installed size. The only times we do need the latter are for the
RPATH of `llvm-tools-preview` binaries, and for linking `rustc-dev`
libraries. We'll move it to the `llvm-tools-preview` component directly,
and `rustc-dev` will have an implicit dependency on it.
Here are the dist sizes that I got before and after this change:
llvm-tools-1.45.0-dev-x86_64-unknown-linux-gnu.tar.gz 1.3M 24M
llvm-tools-1.45.0-dev-x86_64-unknown-linux-gnu.tar.xz 748K 17M
rustc-1.45.0-dev-x86_64-unknown-linux-gnu.tar.gz 83M 61M
rustc-1.45.0-dev-x86_64-unknown-linux-gnu.tar.xz 56M 41M
The installed size should reduce by exactly one `libLLVM.so` (~70-80M),
unless you also install `llvm-tools`, and then it should be identical.
Add to the list of words clippy::doc_markdown ignores
"TypeScript" is the only one of these I actually ran into organically; I can remove the others if they're too much.
changelog: Add to the list of words `clippy::doc_markdown` ignores
When MSVC's `link.exe` wasn't found but another `link.exe` was, the error message given can be impenetrable to many users. The usual suspect is GNU's `link` tool. In this case, inform the user that they may need to install VS build tools.
This only applies when Microsoft's link tool is expected. Not `lld-link` or other MSVC compatible linkers.
Downgrade `match_wild_err_arm` to pedantic and update help messages
Hi,
This fixes#3688 and downgrades `match_wild_err_arm` to pedantic.
There are a lot of different reasons in that issue, for me the biggest are:
1. Rust's errors aren't like Java's exceptions because they're type safe and in most cases the type of error can't change by itself.
2. Sometimes matching can be more ergonomic, and before the `track_caller` feature got introduced it was actually easier to track the panic location with explicit `panic!` than with `expect`.
Currently clippy is failing to build because of a breaking change in https://github.com/rust-lang/rust/pull/69171 I tried fixing it but it is too complex for my little knowledge of clippy and rustc so I'll leave that to people who know what they're doing :)
Another thing, if rustc is breaking clippy a lot then maybe it's better to use something like `miri` does, where it's hard codes the latest tested rustc commit and they keep bumping it, that way when you develop locally it should work even if there was a breaking change (https://github.com/rust-lang/miri/blob/master/rustup-toolchain#L23-L29)
changelog: Downgrade `match_wild_err_arm` to pedantic
New lint: `match_wildcard_for_single_variants`
changelog: Added a new lint match_wildcard_for_single_variants to warn on enum matches where a wildcard is used to match a single variant
Closes#5556
Adjust the zero check in `RawVec::grow`.
This was supposed to land as part of #72227. (I wish `git push` would
abort when you have uncommited changes.)
r? @Amanieu
Continue lowering for unsupported async generator instead of returning an error.
This way the hir is "valid" and we can remove one more call to
`opt_node_id_to_hir_id` but an error is still emitted.
This is another partial fix for #71104
r? @eddyb
Make `fold` standalone.
`fold` is currently implemented via `try_fold`, but implementing it
directly results in slightly less LLVM IR being generated, speeding up
compilation of some benchmarks.
r? @cuviper
Suggest fixes and add error recovery for `use foo::self`
Fixes#63741.
I have implemented 2 suggestions on how to fix a `use foo::self` import, however I feel like showing them both might be too verbose.
Additionally, I have also implemented error recovery as [menitoned](https://github.com/rust-lang/rust/issues/63741#issuecomment-602391091) by @comex.
I believe r? @estebank deals with diagnostics.
Rustup
@oli-obk Do you know, how we can enforce (ui-)tests pass in rust-lang/rust for Clippy? I can open a PR for this, if you tell me what would be necessary for this.
changelog: none
