Implement token-based handling of attributes during expansion #82608

Aaron1011 · 2021-02-27T20:10:32Z

This PR modifies the macro expansion infrastructure to handle attributes
in a fully token-based manner. As a result:

Derives macros no longer lose spans when their input is modified
by eager cfg-expansion. This is accomplished by performing eager
cfg-expansion on the token stream that we pass to the derive
proc-macro
Inner attributes now preserve spans in all cases, including when we
have multiple inner attributes in a row.

This is accomplished through the following changes:

New structs AttrAnnotatedTokenStream and AttrAnnotatedTokenTree are introduced.
These are very similar to a normal TokenTree, but they also track
the position of attributes and attribute targets within the stream.
They are built when we collect tokens during parsing.
An AttrAnnotatedTokenStream is converted to a regular TokenStream when
we invoke a macro.
Token capturing and LazyTokenStream are modified to work with
AttrAnnotatedTokenStream. A new ReplaceRange type is introduced, which
is created during the parsing of a nested AST node to make the 'outer'
AST node aware of the attributes and attribute target stored deeper in the token stream.
When we need to perform eager cfg-expansion (either due to #[derive] or #[cfg_eval]), we tokenize and reparse our target, capturing additional information about the locations of #[cfg] and #[cfg_attr] attributes at any depth within the target. This is a performance optimization, allowing us to perform less work in the typical case where captured tokens never have eager cfg-expansion run.

Aaron1011 · 2021-02-27T20:11:19Z

@bors try @rust-timer queue

rust-timer · 2021-02-27T20:11:20Z

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

bors · 2021-02-27T20:11:29Z

⌛ Trying commit ac71b40b84add10df1cc6b4394ca53f5c3bfe16d with merge b86108850e24b4dd26ad05cb34d04ef489f2385a...

bors · 2021-02-27T21:01:55Z

☀️ Try build successful - checks-actions
Build commit: b86108850e24b4dd26ad05cb34d04ef489f2385a (b86108850e24b4dd26ad05cb34d04ef489f2385a)

rust-timer · 2021-02-27T21:01:57Z

Queued b86108850e24b4dd26ad05cb34d04ef489f2385a with parent ec7f8d9, future comparison URL.

rust-timer · 2021-02-27T23:23:47Z

Finished benchmarking try commit (b86108850e24b4dd26ad05cb34d04ef489f2385a): 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 rollup- to bors.

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
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

petrochenkov · 2021-02-28T19:41:45Z

@Aaron1011
Could you move tests to a separate PR or commit? I'm interested in diffs in test outputs before and after the compiler changes.

Aaron1011 · 2021-02-28T19:43:36Z

@petrochenkov Sure

Aaron1011 · 2021-02-28T20:15:20Z

Opened #82643

compiler/rustc_ast/src/ast_like.rs

compiler/rustc_ast/src/attr/mod.rs

compiler/rustc_ast/src/tokenstream.rs

compiler/rustc_ast/src/mut_visit.rs

compiler/rustc_expand/src/config.rs

compiler/rustc_expand/src/lib.rs

petrochenkov · 2021-02-28T20:28:45Z

(Still need to review changes in rustc_parse.)

Aaron1011 · 2021-02-28T21:30:38Z

@bors try @rust-timer queue

rust-timer · 2021-02-28T21:30:39Z

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

bors · 2021-02-28T21:30:47Z

⌛ Trying commit 87977c6a776ca0b4075f0998bde21267b3addcd6 with merge f1c431c58af7789983cbdfd61c470034c37eb631...

bors · 2021-02-28T22:17:01Z

☀️ Try build successful - checks-actions
Build commit: f1c431c58af7789983cbdfd61c470034c37eb631 (f1c431c58af7789983cbdfd61c470034c37eb631)

rust-timer · 2021-02-28T22:17:02Z

Queued f1c431c58af7789983cbdfd61c470034c37eb631 with parent 573a697, future comparison URL.

rust-timer · 2021-03-01T01:11:04Z

Finished benchmarking try commit (f1c431c58af7789983cbdfd61c470034c37eb631): 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 rollup- to bors.

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
@rustbot label: +S-waiting-on-review -S-waiting-on-perf

Aaron1011 · 2021-03-01T05:19:58Z

There appears to be a significant hit from being unable to bail out early from collect_tokens_trailing_token when parsing an expression. We have several different options:

Accept the performance hit. This is a pretty bad option, as I suspect this could be a measurable slowdown on large, complex projects.
Refactor expression parsing to determine in advance if the specific type of expression we are parsing (e.g. an if expression) supports inner attributes. However, the expression parsing code is already quite complicated, and this would require introducing even more complexity.
Speed up the slower path of collect_tokens_trailing_token. Given the current design of the parser, I think this will prove somewhat difficult. We need to clone the current token and the TokenCursor, which I think is causing most of the slowdown
Try to detect if inner attributes are definitely not present in the token stream. This would be kind of a hack, since we'd be effectively re-implementing part of the parser in collect_tokens_trailing_token. If inner attributes are present, then we will have the tokens <open_delimiter> # ! ... <close_delimiter> somewhere in the input. However, src/test/ui/proc-macro/weird-braces.rs shows that finding where this occurs is very tricky without actually parsing all of the tokens.

…=petrochenkov Fix lookahead with None-delimited group Fixes rust-lang#84162, a regression introduced by rust-lang#82608.

parser: Remove support for inner attributes on non-block expressions Remove support for attributes like ```rust fn attrs() { (#![print_target_and_args(fifth)] 1, 2); [#![print_target_and_args(sixth)] 1 , 2]; [#![print_target_and_args(seventh)] true ; 5]; match 0 { #![print_target_and_args(eighth)] _ => {} } MyStruct { #![print_target_and_args(ninth)] field: true }; } ``` They are - useless - unstable (modulo holes like rust-lang#65860) - pessimize compiler performance, namely token collection for macros (cc rust-lang#82608) I still want to run crater on this to check whether the stability holes are exploited in practice, and whether such attributes are used at all.

Pkgsrc changes: * Bump bootstrap requirements to 1.52.1 * Adjust patches, adapt to upstream changes, adjust cargo checksums * If using an external llvm, require >= 10.0 Upsteream changes: Version 1.53.0 (2021-06-17) ============================ Language ----------------------- - [You can now use unicode for identifiers.][83799] This allows multilingual identifiers but still doesn't allow glyphs that are not considered characters such as `#` (diamond) or `<U+1F980>` (crab). More specifically you can now use any identifier that matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This is the same standard as languages like Python, however Rust uses NFC normalization which may be different from other languages. - [You can now specify "or patterns" inside pattern matches.][79278] Previously you could only use `|` (OR) on complete patterns. E.g. ```rust let x = Some(2u8); // Before matches!(x, Some(1) | Some(2)); // Now matches!(x, Some(1 | 2)); ``` - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher has the same semantics as the `:pat` matcher. This is to allow `:pat` to change semantics to being a pattern fragment in a future edition. Compiler ----------------------- - [Updated the minimum external LLVM version to LLVM 10.][83387] - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525] - [Improved debuginfo for closures and async functions on Windows MSVC.][83941] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries ----------------------- - [Abort messages will now forward to `android_set_abort_message` on Android platforms when available.][81469] - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771] - [Arrays of any length now implement `IntoIterator`.][84147] Currently calling `.into_iter()` as a method on an array will return `impl Iterator<Item=&T>`, but this may change in a future edition to change `Item` to `T`. Calling `IntoIterator::into_iter` directly on arrays will provide `impl Iterator<Item=T>` as expected. - [`leading_zeros`, and `trailing_zeros` are now available on all `NonZero` integer types.][84082] - [`{f32, f64}::from_str` now parse and print special values (`NaN`, `-0`) according to IEEE RFC 754.][78618] - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704] - [Add the `BITS` associated constant to all numeric types.][82565] Stabilised APIs --------------- - [`AtomicBool::fetch_update`] - [`AtomicPtr::fetch_update`] - [`BTreeMap::retain`] - [`BTreeSet::retain`] - [`BufReader::seek_relative`] - [`DebugStruct::non_exhaustive`] - [`Duration::MAX`] - [`Duration::ZERO`] - [`Duration::is_zero`] - [`Duration::saturating_add`] - [`Duration::saturating_mul`] - [`Duration::saturating_sub`] - [`ErrorKind::Unsupported`] - [`Option::insert`] - [`Ordering::is_eq`] - [`Ordering::is_ge`] - [`Ordering::is_gt`] - [`Ordering::is_le`] - [`Ordering::is_lt`] - [`Ordering::is_ne`] - [`OsStr::is_ascii`] - [`OsStr::make_ascii_lowercase`] - [`OsStr::make_ascii_uppercase`] - [`OsStr::to_ascii_lowercase`] - [`OsStr::to_ascii_uppercase`] - [`Peekable::peek_mut`] - [`Rc::decrement_strong_count`] - [`Rc::increment_strong_count`] - [`Vec::extend_from_within`] - [`array::from_mut`] - [`array::from_ref`] - [`char::MAX`] - [`char::REPLACEMENT_CHARACTER`] - [`char::UNICODE_VERSION`] - [`char::decode_utf16`] - [`char::from_digit`] - [`char::from_u32_unchecked`] - [`char::from_u32`] - [`cmp::max_by_key`] - [`cmp::max_by`] - [`cmp::min_by_key`] - [`cmp::min_by`] - [`f32::is_subnormal`] - [`f64::is_subnormal`] Cargo ----------------------- - [Cargo now supports git repositories where the default `HEAD` branch is not "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format which can handle default branches correctly. - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298] - [The `authors` field is no longer included in `Cargo.toml` for new projects.][cargo/9282] Rustdoc ----------------------- - [Added the `rustdoc::bare_urls` lint that warns when you have URLs without hyperlinks.][81764] Compatibility Notes ------------------- - [Implement token-based handling of attributes during expansion][82608] - [`Ipv4::from_str` will now reject octal format IP addresses in addition to rejecting hexadecimal IP addresses.][83652] The octal format can lead to confusion and potential security vulnerabilities and [is no longer recommended][ietf6943]. Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [Rework the `std::sys::windows::alloc` implementation.][83065] - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864] - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681] - [Rework rustdoc const type][82873] [83386]: rust-lang/rust#83386 [82771]: rust-lang/rust#82771 [84147]: rust-lang/rust#84147 [84082]: rust-lang/rust#84082 [83799]: rust-lang/rust#83799 [83681]: rust-lang/rust#83681 [83652]: rust-lang/rust#83652 [83387]: rust-lang/rust#83387 [82873]: rust-lang/rust#82873 [82864]: rust-lang/rust#82864 [82608]: rust-lang/rust#82608 [82565]: rust-lang/rust#82565 [80525]: rust-lang/rust#80525 [79278]: rust-lang/rust#79278 [78618]: rust-lang/rust#78618 [77704]: rust-lang/rust#77704 [83941]: rust-lang/rust#83941 [83065]: rust-lang/rust#83065 [81764]: rust-lang/rust#81764 [81469]: rust-lang/rust#81469 [cargo/9298]: rust-lang/cargo#9298 [cargo/9282]: rust-lang/cargo#9282 [cargo/9392]: rust-lang/cargo#9392 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1

…tatable, r=Aaron1011 Avoid uneccessary clone of Annotatable Addresses FIXME comment created in rust-lang#82608 r? `@Aaron1011`

`make_tokenstream` has three commented hacks, and a comment at the top referring to rust-lang#67062. These hacks have no observable effect, at least as judged by running the test suite. The hacks were added in rust-lang#82608, with an explanation [here](rust-lang#82608 (comment)). It appears that one of the following is true: (a) they never did anything useful, (b) they do something useful but we have no test coverage for them, or (c) something has changed in the meantime that means they are no longer necessary. This commit removes the hacks and the comments, in the hope that (b) is not true.

…cks, r=Aaron1011 Remove hacks in `make_token_stream`. `make_tokenstream` has three commented hacks, and a comment at the top referring to rust-lang#67062. These hacks have no observable effect, at least as judged by running the test suite. The hacks were added in rust-lang#82608, with an explanation [here](rust-lang#82608 (comment)). It appears that one of the following is true: (a) they never did anything useful, (b) they do something useful but we have no test coverage for them, or (c) something has changed in the meantime that means they are no longer necessary. This commit removes the hacks and the comments, in the hope that (b) is not true. r? `@Aaron1011`

…ron1011 Remove hacks in `make_token_stream`. `make_tokenstream` has three commented hacks, and a comment at the top referring to #67062. These hacks have no observable effect, at least as judged by running the test suite. The hacks were added in #82608, with an explanation [here](rust-lang/rust#82608 (comment)). It appears that one of the following is true: (a) they never did anything useful, (b) they do something useful but we have no test coverage for them, or (c) something has changed in the meantime that means they are no longer necessary. This commit removes the hacks and the comments, in the hope that (b) is not true. r? `@Aaron1011`

rust-highfive assigned petrochenkov Feb 27, 2021

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 27, 2021

Aaron1011 mentioned this pull request Feb 27, 2021

[WIP] Implement token-based handling of attributes #80689

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rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Feb 27, 2021

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petrochenkov reviewed Feb 28, 2021

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Aaron1011 mentioned this pull request Feb 28, 2021

Add more proc-macro attribute tests #82643

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Aaron1011 force-pushed the feature/final-preexp-tts branch from ac71b40 to 87977c6 Compare February 28, 2021 21:30

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Feb 28, 2021

rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Mar 1, 2021

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nrc mentioned this pull request Apr 13, 2021

Fix two bugs with insert and delete tikv/client-rust#253

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pnkfelix mentioned this pull request Apr 14, 2021

clang-sys 0.29.3 fails to build on nightly #84162

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emilio mentioned this pull request Apr 14, 2021

clang-sys no longer builds on the latest nightly #84188

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jyn514 mentioned this pull request Apr 14, 2021

Fix lookahead with None-delimited group #84130

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bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 14, 2021

Auto merge of rust-lang#84130 - Aaron1011:fix/none-delim-lookahead, r…

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…=petrochenkov Fix lookahead with None-delimited group Fixes rust-lang#84162, a regression introduced by rust-lang#82608.

RalfJung mentioned this pull request Apr 27, 2021

rustfmt no longer builds after rust-lang/rust#84310 #84538

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nikomatsakis mentioned this pull request May 6, 2021

add back support for inner attributes on non-block expressions? #84879

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hellow554 mentioned this pull request May 18, 2021

Nightly rejects some macro-generated doc attribute values accepted by stable #85432

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jyn514 mentioned this pull request May 18, 2021

Fix incorrect gating of nonterminals in key-value attributes #85445

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Aaron1011 mentioned this pull request May 25, 2021

regression: proc-macro derive unparseable #85692

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hellow554 mentioned this pull request Jul 2, 2021

ICE when using serde derives with an invalid inner doc comment #86781

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samlich mentioned this pull request Jul 29, 2021

ICE: Should not have unglued last token with cfg attr #87577

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apiraino mentioned this pull request Aug 12, 2021

ICE "Found outer attribute Attribute" #87936

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eggyal mentioned this pull request Nov 28, 2021

Avoid uneccessary clone of Annotatable #91324

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nnethercote mentioned this pull request Apr 27, 2022

Less NoDelim #96421

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nnethercote mentioned this pull request Apr 29, 2022

Remove hacks in make_token_stream. #96543

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matthiaskrgr mentioned this pull request Oct 16, 2023

ice: Mismatched open/close delims #116781

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tgross35 mentioned this pull request Jul 8, 2024

Clear inner_attr_ranges regularly. #127477

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Implement token-based handling of attributes during expansion #82608

Implement token-based handling of attributes during expansion #82608

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