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Fix `clippy::useless_conversion`
Self-explanatory. Probably the last clippy change I'll actually put up since this is the only other one I've actually seen in the wild.
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Rustc driver cleanup
This adds a few comments to the driver to clarify a bit what's happening and does some cleanup.
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This commit does the following.
- Renames `collect_tokens_trailing_token` as `collect_tokens`, because
(a) it's annoying long, and (b) the `_trailing_token` bit is less
accurate now that its types have changed.
- In `collect_tokens`, adds a `Option<CollectPos>` argument and a
`UsePreAttrPos` in the return type of `f`. These are used in
`parse_expr_force_collect` (for vanilla expressions) and in
`parse_stmt_without_recovery` (for two different cases of expression
statements). Together these ensure are enough to fix all the problems
with token collection and assoc expressions. The changes to the
`stringify.rs` test demonstrate some of these.
- Adds a new test. The code in this test was causing an assertion
failure prior to this commit, due to an invalid `NodeRange`.
The extra complexity is annoying, but necessary to fix the existing
problems.
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This pre-existing type is suitable for use with the return value of the
`f` parameter in `collect_tokens_trailing_token`. The more descriptive
name will be useful because the next commit will add another boolean
value to the return value of `f`.
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This lets us compare a `Token` with a `TokenKind`. It's used a lot, but
can be used even more, avoiding the need for some `.kind` uses.
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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This was handled correctly already for `extern unsafe fn()`.
Co-authored-by: Folkert <folkert@folkertdev.nl>
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fixes #128042
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Parser: Suggest Placing the Return Type After Function Parameters
Fixes #126311
This PR suggests placing the return type after the function parameters when it's misplaced after a `where` clause.
This also tangentially improves diagnostics for cases like [this](https://github.com/veera-sivarajan/rust/blob/86d6f1312a77997ef994240e716288d61a343a6d/tests/ui/parser/issues/misplaced-return-type-without-where-issue-126311.rs#L1C1-L1C28) and adds doc comments for `parser::AllowPlus`.
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It's used in `Parser::collect_tokens_trailing_token` to decide whether
to capture a trailing token. But the callers actually know whether to
capture a trailing token, so it's simpler for them to just pass in a
bool.
Also, the `TrailingToken::Gt` case was weird, because it didn't result
in a trailing token being captured. It could have been subsumed by the
`TrailingToken::MaybeComma` case, and it effectively is in the new code.
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Some parser improvements
I was looking closely at attribute handling in the parser while debugging some issues relating to #124141, and found a few small improvements.
``@spastorino``
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It has a single call site, it isn't that big, and its name is
confusingly similar to `Parser::parse_item_common`.
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Make parse error suggestions verbose and fix spans
Go over all structured parser suggestions and make them verbose style.
When suggesting to add or remove delimiters, turn them into multiple suggestion parts.
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Go over all structured parser suggestions and make them verbose style.
When suggesting to add or remove delimiters, turn them into multiple suggestion parts.
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Use verbose style when suggesting changing `const` with `let`
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We currently use `can_begin_literal_maybe_minus` in a couple of places
where only string literals are allowed. This commit introduces a
more specific function, which makes things clearer. It doesn't change
behaviour because the two functions affected (`is_unsafe_foreign_mod`
and `check_keyword_case`) are always followed by a call to `parse_abi`,
which checks again for a string literal.
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delegation: Implement glob delegation
Support delegating to all trait methods in one go.
Overriding globs with explicit definitions is also supported.
The implementation is generally based on the design from https://github.com/rust-lang/rfcs/pull/3530#issuecomment-2020869823, but unlike with list delegation in https://github.com/rust-lang/rust/pull/123413 we cannot expand glob delegation eagerly.
We have to enqueue it into the queue of unexpanded macros (most other macros are processed this way too), and then a glob delegation waits in that queue until its trait path is resolved, and enough code expands to generate the identifier list produced from the glob.
Glob delegation is only allowed in impls, and can only point to traits.
Supporting it in other places gives very little practical benefit, but significantly raises the implementation complexity.
Part of https://github.com/rust-lang/rust/issues/118212.
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More `rustc_parse` cleanups
Following on from #125815.
r? `@spastorino`
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Rename Unsafe to Safety
Alternative to #124455, which is to just have one Safety enum to use everywhere, this opens the posibility of adding `ast::Safety::Safe` that's useful for unsafe extern blocks.
This leaves us today with:
```rust
enum ast::Safety {
Unsafe(Span),
Default,
// Safe (going to be added for unsafe extern blocks)
}
enum hir::Safety {
Unsafe,
Safe,
}
```
We would convert from `ast::Safety::Default` into the right Safety level according the context.
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Improve parser
Fixes #124935.
- Add a few more help diagnostics to incorrect semicolons
- Overall improved that function
- Addded a few comments
- Renamed diff_marker fns to git_diff_marker
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conflicts specifically and a few more improvements.
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```rust
reuse prefix::{a, b, c}
```
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