chore(deps): update rust crate syn to v3 by renovate[bot] · Pull Request #10362 · rolldown/rolldown

renovate · 2026-07-19T23:48:59Z

This PR contains the following updates:

Package	Type	Update	Change
syn	workspace.dependencies	major	`2` → `3`

Release Notes

dtolnay/syn (syn)

`v3.0.1`

Compare Source

Parse const traits (#2056, #2057, #2058, #2063, #2064)
Parse unsafe binder types (#2065)
Parse impl restrictions (#2066)

`v3.0.0`

Compare Source

This release contains adjustments to the syntax tree to account for ongoing Rust language development from the 3 years since syn 2.0.0 and to anticipate some in-flight Rust language RFCs.

These include: default values in fields, pinned type sugar, raw lifetimes, generator blocks and functions, unnamed enum variants, attributes in tuple types and tuple patterns, named arguments in parenthesized generic argument lists, lightweight clones, const traits, const function pointers, mutability restricted fields, supertrait auto implementation, final associated functions, trait implementability restrictions, const blocks in path arguments, item-level const blocks, return type notation, never patterns, function delegation, mutable by-reference bindings, in-place initialization, field projections, explicitly dyn-compatible traits, view types, file-level frontmatter, generic const arguments, guard patterns, lazy type aliases, explicitly safe foreign items, super let, unsafe fields, pattern types, heterogeneous try-blocks, function contracts, async function trait bounds, static closure coroutine syntax, unsafe binder types, move expressions, for-await loops, and postfix keywords.

[API documentation for 3.0]

Breaking changes

Modifiers

To reserve more room for language evolution, there are 10 new non-exhaustive structs in the syntax tree having the following commonality:

Name ending in Modifiers. {BlockModifiers, ClosureModifiers, ConstModifiers, FieldModifiers, FnModifiers, ImplModifiers, LocalModifiers, TraitBoundModifiers, TraitModifiers, TypeModifiers}
Each implements Default. The default value is guaranteed to comprise no tokens.
Non-exhaustive. Can only be instantiated by Syn's parser or by creating and then mutating ▁▁Modifiers::default().
Does not implement Parse. When parsing, they are parsed by the enclosing syntax tree node.
Does not implement ToTokens. In some cases the syntax that these nodes might hold in the future is not necessarily contiguous tokens.
Provides .require_empty() -> Result<()> which returns a meaningfully spanned error if the modifiers are different from the empty default. This enables a caller to reject syntax it does not recognize without knowing what that syntax may be.

Types

Type::BareFn has been renamed to Type::FnPtr to mirror the compiler's terminology. Together with this, BareVariadic is renamed to FnPtrVariadic.
The mutually exclusive const_token and mutability fields of Type::Ptr have been unified into an enum of type PointerMutability, which was already previously used by Expr::RawAddr.
Every Type variant now holds attributes, which can represent the attributes of element types inside a tuple type, or attributes for a function return type.
BareFnArg is renamed to NamedArg and is used in ParenthesizedGenericArguments, in addition to the existing use in Type::FnPtr.

Expressions

In Expr::Closure, the fields or1_token and or2_token have been renamed to inputs_begin and inputs_end to indicate the beginning and ending | token of the closure inputs.

Statements

Attributes are now preserved on all expression kinds in statement position. Previously, parsing would silently lose attributes on some expression statements without a dedicated Expr variant, such as tail-call expressions.

Patterns

The guard field of Arm is replaced by a new Pat::Guard variant held in the arm's pat.

Items

The unsafety field of Signature, which represented the presence or absence of unsafe, is replaced by a 3-way Safety enum which may be safe, unsafe, or default. ForeignItem::Static also gets a Safety.
Some of the fields of Receiver have been split to a non-exhaustive ReceiverKind enum to create room for proposed new kinds of method receivers, such as pinned.
Type aliases now hold a WhereClausePlacement to distinguish between early placement (which is the default for item-level type aliases and is deprecated in associated type aliases) and late placement (which is the default for associated type aliases and is unstable in item-level type aliases). Parsing and printing a syntax tree will now preserve the where-clause placement rather than rewriting it to the default placement for the item kind.

Generics

WherePredicate::Lifetime and WherePredicate::Type have a new field holding the attributes on the where-predicates.
GenericParam::Type and GenericParam::Const now match the rest of the syntax tree in holding their optional default using a single Option of tuple, rather than a pair of Option.

Literals

The Parse implementation of Lifetime no longer permits keyword lifetimes, matching a change in Rust 1.81 to deny such lifetimes pre-expansion. Lifetime::parse_any may be used to parse lifetimes permissive of keywords.
LitInt and LitFloat no longer implement From<proc_macro2::Literal>. Use Lit::new(literal) and then match Lit::Int or Lit::Float.
The StrStyle enum was unused and has been deleted.

More

File contains a new Option<Frontmatter>, but does not yet parse frontmatter in syn::parse_file until that language feature progresses closer to stabilization.
Some enums no longer provide From impls. Construct the variant by name instead, such as Expr::Array(e) in place of e.into().
The pop method of Punctuated<T, P> now returns Option<T> discarding the trailing punctuation if any, rather than Option<Pair<T, P>>. A new method pop_pair provides the old behavior.
Syntax tree traversal (visit, visit_mut, fold) no longer provides a method for processing Span. This was already incompletely supported and never walked most of the spans in a syntax tree.
The Speculative and AnyDelimiter traits have been sealed and cannot be implemented for types outside of Syn's ParseStream.

`v2.0.119`

Compare Source

Preserve attributes on tail-call expressions in statement position (#1994)
Parse field-representing types builtin in type position (#1996)

Configuration

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netlify · 2026-07-19T23:49:13Z

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socket-security · 2026-07-19T23:51:08Z

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/prettyplease@0.2.37 ⏵ 0.3.0
	cargo/syn@3.0.1

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codspeed · 2026-07-19T23:56:17Z

Merging this PR will not alter performance

✅ 7 untouched benchmarks
⏩ 10 skipped benchmarks¹

_{Comparing renovate/major-rust-crates (8772b04) with main (ad44b96)}

10 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

renovate · 2026-07-20T02:28:12Z

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@h-a-n-a

## [1.2.1] - 2026-07-29 ### 🚀 Features - dev: support `hotUpdate` hook (#10305) by @h-a-n-a - dev: expose `disableWatcher` through the dev engine bindings (#10474) by @shulaoda - plugin: surface output-option callbacks in [PLUGIN_TIMINGS] (#10411) by @IWANABETHATGUY - `import.meta.ROLLDOWN_FILE_URL_<referenceId>_<urlId>` support to pass context to `resolveFileUrl` hook (#10297) by @sapphi-red - dev: skip the HMR update when a module's rebuilt output is unchanged (#10333) by @h-a-n-a - code-splitting: wrap strict execution order modules on demand (#10104) by @hyfdev - support `import.meta.ROLLDOWN_FILE_URL_*` (#10296) by @sapphi-red - implement `resolveFileUrl` plugin hook (#10291) by @sapphi-red - magic-string: support storeName on overwrite/update (#10312) by @IWANABETHATGUY ### 🐛 Bug Fixes - external: keep `__toESM` when the importing module is tree-shaken (#10516) by @IWANABETHATGUY - dev: resolve re-exports from externals through a real import (#10489) by @tbvjaos510 - code-splitting: route CJS barrel initialization per consumer (#10488) by @hyfdev - error: align filename-pattern diagnostics with Rollup's wording (#10501) by @IWANABETHATGUY - plugin: validate emitted prebuilt-chunk file names (#10399) by @IWANABETHATGUY - code-splitting: point a two-argument dynamic import at the chunk that holds the module (#10479) by @hyfdev - common: align is_path_fragment with Rollup's isPathFragment (#10398) by @IWANABETHATGUY - code-splitting: never name an internal chunk export `then` (#10480) by @hyfdev - code-splitting: avoid creating call-site-triggered entry facades (#10485) by @hyfdev - code-splitting: collect top-level eager order reasons in every strict build (#10463) by @hyfdev - code-splitting: let a cross-chunk dynamic importer carry the order trigger (#10456) by @hyfdev - code-splitting: avoid the dynamic-entry facade when the same-chunk collapse carries the trigger (#10433) by @hyfdev - binding: forward resolveId options.kind to callable builtin plugins (#10440) by @martijnwalraven - dev: keep the export name of `export * as ns from` (#10476) by @tbvjaos510 - code-splitting: only split an entry facade when something else can load its chunk (#10441) by @hyfdev - code-splitting: fold the runtime chunk back after order lowering (#10414) by @hyfdev - runtime: don't leave default undefined for cjs that fakes __esModule (#10453) by @IWANABETHATGUY - import-glob: escape generated string literals (#10438) by @shantanuraj - preserve-modules: don't assume every chunk mirrors a module (#10442) by @hyfdev - filter: treat missing hook inputs as non-matches, not panics (#10443) by @IWANABETHATGUY - code-splitting: keep CommonJS modules wrapped under strict execution order (#10405) by @hyfdev - code-splitting: align dynamicImports metadata with the rewritten import() specifier (#10430) by @hyfdev - dev: skip user plugin hooks for ?rolldown-lazy proxy modules (#10426) by @unknownjedi - treeshake: preserve side-effect-free spread arguments in manual-pure chains (#10432) by @IWANABETHATGUY - treeshake: preserve eagerly evaluated child effects of manual pure chains (#10427) by @Nic-Polumeyv - code-splitting: initialize pure definers behind star re-export barrels under strict execution order (#10409) by @hyfdev - resolveId: reject string `id` filters (must be a RegExp) (#10412) by @IWANABETHATGUY - code-splitting: collect eager order reasons for on-demand wrapping (#10387) by @hyfdev - rolldown: apply output.paths to CJS export-star of external modules (#10406) by @IWANABETHATGUY - dev: sourcemaps of lazily compiled chunks (#10386) by @tbvjaos510 - plugin: validate emitted file names at emitFile time (#10377) by @Nic-Polumeyv - guarantee tokio runtime release when close rejects (#10381) by @shulaoda - code-splitting: make strict transitive init registration deterministic and constant-time (#10320) by @hyfdev - pair tokio runtime acquire and release on wasm to prevent premature shutdown (#10363) by @shulaoda - don't body-demand modules from simulated facade chunk includes (#10351) by @IWANABETHATGUY - tracing: invalid RD_LOG filter and RD_LOG_OUTPUT=json no longer panic (#10343) by @Brooooooklyn - code-splitting: treat class definition-time global reads as order-sensitive (#10322) by @hyfdev - code-splitting: deconflict force-included runtime helper statements (#10336) by @hyfdev - binding: forward all missing parallel JS plugin hooks (#10345) by @Brooooooklyn - code-splitting: re-derive chunk exec order after the runtime sweep (#10334) by @hyfdev - types: add undefined to ExistingRawSourceMap optional properties (#10355) by @ocavue - magic-string: validate relocate ranges before rewiring (#10327) by @IWANABETHATGUY - add EMPTY_IMPORT_META warning for non-node CJS output (#10222) by @sapphi-red - call `resolveFileUrl` in a deterministic order (#10330) by @sapphi-red - magic-string: refuse repeated sendMagicString on a consumed instance (#10331) by @IWANABETHATGUY - magic-string: refuse to use a MagicString after sendMagicString consumed it (#10326) by @IWANABETHATGUY - magic-string: reject non-contiguous moves before rewiring the chunk list (#10311) by @IWANABETHATGUY - handle `./foo/bar` glob pattern the same as `foo/bar` (#10313) by @sapphi-red - magic-string: throw instead of panicking when append/prepend splits an edited chunk (#10301) by @IWANABETHATGUY - output: skip separator for empty hoisted functions (#10310) by @hyfdev - magic-string: don't report a change when edits cancel out (#10299) by @IWANABETHATGUY - sourcemap: map wrapped imported callees (#10288) by @hyfdev - magic-string: count positional inserts at index 0 on an empty source (#10306) by @IWANABETHATGUY - magic-string: return UTF-16 code units from length() (#10295) by @IWANABETHATGUY - output: skip separator for empty import prelude (#10289) by @hyfdev ### 🚜 Refactor - dev: make it easier to customize the runtime (#10338) by @sapphi-red - code-splitting: declare CJS carrier namespaces initializer-free (#10513) by @hyfdev - rollup-tests: avoid relying on `NODE_PATH` env var resolution (#10496) by @sapphi-red - code-splitting: derive symbol chunk ownership as pass-local link data (#10449) by @hyfdev - plugin: share asset emission helpers between copy_module and asset_module (#10450) by @Nic-Polumeyv - plugin: dedupe hook binding boilerplate (#10428) by @Nic-Polumeyv - plugin: share the oxc parse preamble between import-glob and dynamic-import-vars (#10452) by @Nic-Polumeyv - implement `GetAstBuilder` on visitor/pass types (#10424) by @overlookmotel - pass arrays to AST builder methods (#10419) by @overlookmotel - shorten AST builder code (#10418) by @overlookmotel - centralize final ESM init metadata (#10376) by @hyfdev - descriptor-based parallel-plugin detection (getParallelPluginInfo) (#10349) by @Brooooooklyn - remove AstFactory in favor of new_* construction traits (#10353) by @Boshen - enable oxc_ast's `disable_old_builder` feature (#10316) by @Boshen ### 📚 Documentation - development-guide: update config.json link line reference (#10523) by @dogledogle - clarify slash normalization for id hook filter (#10511) by @sapphi-red - code-splitting: record the thenable-namespace rule (#10502) by @hyfdev - clarify that `esmExternalRequirePlugin` must own its externals (#10439) by @TheAlexLichter - add troubleshooting entry for the @rolldown/binding-... resolution error (#10390) by @Nic-Polumeyv - add Code Splitting API reference category (#10382) by @vittorioexp ### ⚡ Performance - use VisitJsMut in JavaScript-only AST passes (#10507) by @Boshen - cache the resolved glob matcher for Id/ImporterId filters (#10410) by @IWANABETHATGUY - scope_hoisting: remove `alloc` field from `ScopeHoistingFinalizer` (#10425) by @overlookmotel - reduce string allocations (#10423) by @overlookmotel - hmr: remove unnecessary string allocations (#10422) by @overlookmotel - avoid allocating static strings via custom builder methods (#10421) by @overlookmotel - pass string literals to AST builder methods (#10420) by @overlookmotel - use VisitJs in JavaScript-only AST passes (#10396) by @Boshen - plugin: shrink erased plugin debug vtables (#10370) by @Boshen - reuse normalized path buffers (#10315) by @hyfdev ### 🧪 Testing - code-splitting: pin CJS barrel fallback triggers and flag-off equivalence (#10514) by @hyfdev - plugin: cover chunk fileName, absolute chunk name, and Windows drive names (#10400) by @IWANABETHATGUY - code-splitting: cover a single-chunk dynamic import of a wrapped module (#10505) by @hyfdev - file: remove the unused .dynamic_import fixture (#10481) by @hyfdev - treeshake: reduce manual-pure fixture to a minimal smoke test, move matrix to unit tests (#10436) by @IWANABETHATGUY - dev: run vite playgrounds under bundled dev (test-serve-bundled) (#10434) by @h-a-n-a - stop snapshots from silently hiding user code inside the runtime region (#10431) by @hyfdev - wasi: add tokio runtime lifecycle regression test (#10379) by @shulaoda - dev: expect preserved hot.data in hmr-whole-chain-dispose (#10380) by @h-a-n-a - code-splitting: pin flag-off wrapped-esm init emission (#10324) by @hyfdev - sourcemap: fix Windows-only failures in composition fixtures (#10368) by @shulaoda - generated-code: mark assert external in symbols_ns2 for deterministic output (#10339) by @hyfdev - code-splitting: cover entries-aware strict init cycle (#10307) by @hyfdev - make `just setup-vite` the only entry point that touches `vite/` (#10332) by @shulaoda - vite-tests: reuse the shared root vite checkout (#10325) by @shulaoda - test-dev-server: drop the vite submodule, track rolldown-canary (#10319) by @shulaoda - vite-tests: track the latest rolldown-canary rebased onto vite main (#10318) by @shulaoda - unify Vite in vite-test and test-dev-server (#10293) by @h-a-n-a ### ⚙️ Miscellaneous Tasks - scope the binding artifact download to `bindings-*` (#10525) by @shulaoda - deps: update napi (#10506) by @renovate[bot] - deps: update rollup submodule for tests to v4.62.3 (#10494) by @rolldown-guard[bot] - deps: upgrade oxc to 0.142.0 (#10497) by @shulaoda - deps: update test262 submodule for tests (#10495) by @rolldown-guard[bot] - deps: update github actions (#10460) by @renovate[bot] - deps: update rust crates (#10462) by @renovate[bot] - deps: update npm packages (#10461) by @renovate[bot] - metric: alert Discord when the metric workflow fails (#10447) by @IWANABETHATGUY - metric: mint a short-lived GitHub App token instead of a PAT (#10446) by @IWANABETHATGUY - repo: repair dangling CLAUDE.md symlink (#10451) by @hanayashiki - publint/package-metadata fixes and small correctness fixes (#10344) by @Brooooooklyn - deps: update dependency vite-plus to v0.2.6 (#10404) by @renovate[bot] - add Semgrep scan workflow (#10395) by @Boshen - enable Windows CI with a PR label (#10375) by @hyfdev - deps: upgrade oxc to 0.141.0 (#10373) by @camc314 - deps: update napi (#10369) by @renovate[bot] - deps: update test262 submodule for tests (#10367) by @rolldown-guard[bot] - deps: update taiki-e/install-action action to v2.83.3 (#10358) by @renovate[bot] - deps: update rust crates (#10357) by @renovate[bot] - deps: update npm packages (#10359) by @renovate[bot] - deps: update rust crate syn to v3 (#10362) by @renovate[bot] - deps: update rust crate oxc_sourcemap to v8.1.2 (#10356) by @renovate[bot] - deps: update dependency vite-plus to v0.2.5 (#10329) by @renovate[bot] - docs: migrate Netlify redirects to Void config (#10282) by @tux-tn - deps: update dependency rust to v1.97.1 (#10317) by @renovate[bot] - runtime: remove unused `runtime/index.js` (#10302) by @IWANABETHATGUY ### ❤️ New Contributors * @dogledogle made their first contribution in [#10523](#10523) * @tbvjaos510 made their first contribution in [#10489](#10489) * @martijnwalraven made their first contribution in [#10440](#10440) * @shantanuraj made their first contribution in [#10438](#10438) * @Nic-Polumeyv made their first contribution in [#10450](#10450) * @hanayashiki made their first contribution in [#10451](#10451) * @unknownjedi made their first contribution in [#10426](#10426) * @vittorioexp made their first contribution in [#10382](#10382) * @tux-tn made their first contribution in [#10282](#10282) Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

chore(deps): update rust crate syn to v3

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shulaoda approved these changes Jul 20, 2026

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shulaoda merged commit 22e9d4c into main Jul 20, 2026
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shulaoda deleted the renovate/major-rust-crates branch July 20, 2026 06:15

rolldown-guard Bot mentioned this pull request Jul 29, 2026

release: v1.2.1 #10524

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chore(deps): update rust crate syn to v3 - #10362

chore(deps): update rust crate syn to v3#10362
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Release Notes

v3.0.1

v3.0.0

Breaking changes

Modifiers

Types

Expressions

Statements

Patterns

Items

Generics

Literals

More

v2.0.119

Configuration

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`v3.0.1`

`v3.0.0`

`v2.0.119`

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