Attach tokens to all AST types used in Nonterminal
#75800
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⌛ Trying commit f1624da705b3b5c569ab49f0560c22e652b9f3ad with merge 249ff4f3249e07e4b951856c7d9938186efce584... |
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Queued 249ff4f3249e07e4b951856c7d9938186efce584 with parent de521cb, future comparison URL. |
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Finished benchmarking try commit (249ff4f3249e07e4b951856c7d9938186efce584): comparison url. Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up. @bors rollup=never |
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Even if this PR doesn't land in its current form, we'll want to make this change eventually. Let's see what the breakage looks like. @craterbot check |
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Code LGTM, perf is acceptable, so only waiting for crater. |
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☔ The latest upstream changes (presumably #73084) made this pull request unmergeable. Please resolve the merge conflicts. |
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A `Visibility` does not have outer attributes, so we only capture tokens when parsing a `macro_rules!` matcher
We currently only attach tokens when parsing a `:stmt` matcher for a `macro_rules!` macro. Proc-macro attributes on statements are still unstable, and need additional work.
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This commit contains miscellaneous changes that don't fit into any of the other commits in this PR
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This looks somewhat concerning, but seems unrelated to this PR. @bors retry |
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The `doc_test!` macro defines two local variables (`entries` and `doc`),
which are then accessed from the provided `block`.
However, this only compiled due to a bug in rustc: substituted
metavariables cannot refer to names defined within the macro body. For
example, the following ode does not compile:
```rust
macro_rules! foo {
($block:expr) => {
let mut bar = false;
$block
}
}
fn main() {
foo!({bar = true});
}
```
In this case, the `doc_test!` macro was incorrectly allowed to compile
due to the presence of the `#[tokio::test]` macro on the enclosing
function. When the underlying compiler bug is fixed in
rust-lang/rust#75800,
this macro will stop compiling.
…etrochenkov Attach tokens to all AST types used in `Nonterminal` We perform token capturing when we have outer attributes (for nonterminals that support attributes - e.g. `Stmt`), or when we parse a `Nonterminal` for a `macro_rules!` argument. The full list of `Nonterminals` affected by this PR is: * `NtBlock` * `NtStmt` * `NtTy` * `NtMeta` * `NtPath` * `NtVis` * `NtLiteral` Of these nonterminals, only `NtStmt` and `NtLiteral` (which is actually just an `Expr`), support outer attributes - the rest only ever have token capturing perform when they match a `macro_rules!` argument. This makes progress towards solving rust-lang#43081 - we now collect tokens for everything that might need them. However, we still need to handle `#[cfg]`, inner attributes, and misc pretty-printing issues (e.g. rust-lang#75734) I've separated the changes into (mostly) independent commits, which could be split into individual PRs for each `Nonterminal` variant. The purpose of having them all in one PR is to do a single Crater run for all of them. Most of the changes in this PR are trivial (adding `tokens: None` everywhere we construct the various AST structs). The significant changes are: * `ast::Visibility` is changed from `type Visibility = Spanned<VisibilityKind>` to a `struct Visibility { kind, span, tokens }`. * `maybe_collect_tokens` is made generic, and used for both `ast::Expr` and `ast::Stmt`. * Some of the statement-parsing functions are refactored so that we can capture the trailing semicolon. * `Nonterminal` and `Expr` both grew by 8 bytes, as some of the structs which are stored inline (rather than behind a `P`) now have an `Option<TokenStream>` field. Hopefully the performance impact of doing this is negligible.
We perform token capturing when we have outer attributes (for nonterminals that support attributes - e.g.
Stmt), or when we parse aNonterminalfor amacro_rules!argument. The full list ofNonterminalsaffected by this PR is:NtBlockNtStmtNtTyNtMetaNtPathNtVisNtLiteralOf these nonterminals, only
NtStmtandNtLiteral(which is actually just anExpr), support outer attributes - the rest only ever have token capturing perform when they match amacro_rules!argument.This makes progress towards solving #43081 - we now collect tokens for everything that might need them. However, we still need to handle
#[cfg], inner attributes, and misc pretty-printing issues (e.g. #75734)I've separated the changes into (mostly) independent commits, which could be split into individual PRs for each
Nonterminalvariant. The purpose of having them all in one PR is to do a single Crater run for all of them.Most of the changes in this PR are trivial (adding
tokens: Noneeverywhere we construct the various AST structs). The significant changes are:ast::Visibilityis changed fromtype Visibility = Spanned<VisibilityKind>to astruct Visibility { kind, span, tokens }.maybe_collect_tokensis made generic, and used for bothast::Exprandast::Stmt.NonterminalandExprboth grew by 8 bytes, as some of the structs which are stored inline (rather than behind aP) now have anOption<TokenStream>field. Hopefully the performance impact of doing this is negligible.