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Part of the necessary work to accomplish #63468.
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Initial implementation of parsing or-patterns e.g., `Some(Foo | Bar)`.
This is a partial implementation of RFC 2535.
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Lint attributes on function arguments
Fixes #61238.
cc #60406
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Remove `ast::Guard`
With the introduction of `ast::ExprKind::Let` in https://github.com/rust-lang/rust/pull/60861, the `ast::Guard` structure is now redundant in terms of representing [`if let` guards](https://github.com/rust-lang/rust/issues/51114) in AST since it can be represented by `ExprKind::Let` syntactically. Therefore, we remove `ast::Guard` here.
However, we keep `hir::Guard` because the semantic representation is a different matter and this story is more unclear right now (might involve `goto 'arm` in HIR or something...).
r? @petrochenkov
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introduce ::Let.
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Here follows the main reverts applied in order to make this commit:
Revert "Rollup merge of #60676 - davidtwco:issue-60674, r=cramertj"
This reverts commit 45b09453dbf120cc23d889435aac3ed7d2ec8eb7, reversing
changes made to f6df1f6c30b469cb9e65c5453a0efa03cbb6005e.
Revert "Rollup merge of #60437 - davidtwco:issue-60236, r=nikomatsakis"
This reverts commit 16939a50ea440e72cb6ecefdaabb988addb1ec0e, reversing
changes made to 12bf98155249783583a91863c5dccf9e346f1226.
Revert "Rollup merge of #59823 - davidtwco:issue-54716, r=cramertj"
This reverts commit 62d1574876f5531bce1b267e62dff520d7adcbbb, reversing
changes made to 4eff8526a789e0dfa8b97f7dec91b7b5c18e8544.
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Adds support for .await under the existing async_await feature gate.
Moves macro-like await! syntax to the await_macro feature gate.
Removes support for `await` as a non-keyword under the `async_await`
feature.
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This commit introduces an `ArgSource` enum that is lowered into the HIR
so that diagnostics can correctly refer to the argument pattern's
original name rather than the generated pattern.
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Rename `type_parameters` to `generics` and so on
Some old variable names had fallen through the generics generalisation pull requests.
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Support defining C compatible variadic functions
## Summary
Add support for defining C compatible variadic functions in unsafe rust with
`extern "C"` according to [RFC 2137].
## Details
### Parsing
When parsing a user defined function that is `unsafe` and `extern "C"` allow
variadic signatures and inject a "spoofed" `VaList` in the new functions
signature. This allows the user to interact with the variadic arguments via a
`VaList` instead of manually using `va_start` and `va_end` (See [RFC 2137] for
details).
### Codegen
When running codegen for a variadic function, remove the "spoofed" `VaList`
from the function signature and inject `va_start` when the arg local
references are created for the function and `va_end` on return.
## TODO
- [x] Get feedback on injecting `va_start/va_end` in MIR vs codegen
- [x] Properly inject `va_end` - It seems like it should be possible to inject
`va_end` on the `TerminatorKind::Return`. I just need to figure out how
to get the `LocalRef` here.
- [x] Properly call Rust defined C variadic functions in Rust - The spoofed
`VaList` causes problems here.
Related to: #44930
r? @ghost
[RFC 2137]: https://github.com/rust-lang/rfcs/blob/master/text/2137-variadic.md
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Add support for defining C compatible variadic functions in unsafe rust
with extern "C".
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Fix style issues and update diagnostic messages
Update src/librustc_passes/diagnostics.rs
Co-Authored-By: doctorn <me@nathancorbyn.com>
Deny nested `async fn` in Rust 2015 edition
Deny nested `async fn` in Rust 2015 edition
Deny nested `async fn` in Rust 2015 edition
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Co-Authored-By: Gabriel Smith <yodaldevoid@users.noreply.github.com>
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`TokenStream` is now almost identical to `ThinTokenStream`. This commit
removes the latter, replacing it with the former.
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Because it's an extra type layer that doesn't really help; in a couple
of places it actively gets in the way, and overall removing it makes the
code nicer. It does, however, move `tokenstream::TokenTree` further away
from the `TokenTree` in `quote.rs`.
More importantly, this change reduces the size of `TokenStream` from 48
bytes to 40 bytes on x86-64, which is enough to slightly reduce
instruction counts on numerous benchmarks, the best by 1.5%.
Note that `open_tt` and `close_tt` have gone from being methods on
`Delimited` to associated methods of `TokenTree`.
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refactor match guard
This is the first step to implement RFC 2294: if-let-guard. Tracking issue: https://github.com/rust-lang/rust/issues/51114
The second step should be introducing another variant `IfLet` in the Guard enum. I separated them into 2 PRs for the convenience of reviewers.
r? @petrochenkov
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(Not `Try` since `QuestionMark` is using that.)
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