dtolnay/syn

View on GitHub

Parser for Rust source code

Stars: 3.4k
Forks: 374
Open beginner issues: 0
Indexed issues: 66
Avg merge: 1d 5h
Merged PRs (30d): 2

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 13, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Open All

66 open issues indexed

Demonstrate parse_quote in the crate-level documentation Open

docs

dtolnay/syn#326 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Correct bounds processing for field types Open

docs

dtolnay/syn#370 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Document that parse_quote should not be called in a loop where previous output is interpolated into the next invocation Open

docs

dtolnay/syn#545 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
improve docs for writing attribute procedural macros that parse ItemFn Open

docs

dtolnay/syn#616 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use Literal::subspan to produce better spans from LitStr::parse Open

enhancement help wanted

dtolnay/syn#621 · 1 comment · 4 reactions · 0 assignees · Indexed Sep 15, 2026
`Generics` does not tokenize its `WhereClause` Open

docs

dtolnay/syn#782 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Add attrs() and attrs_mut() getters to syn::Item Open

dtolnay/syn#866 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Parsing an attribute Open

docs

dtolnay/syn#883 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add “example of an attribute macro” and “example of fn-like macro” to the main docs Open

docs

dtolnay/syn#1062 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Ability to map subspans of a `LitStr` into subspans of the backing `Literal` Open

dtolnay/syn#1219 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Consider whether const generics supersedes the `Token!` macro Open

blocked

dtolnay/syn#1252 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Method to remove values from Punctuated Open

dtolnay/syn#1314 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
RangeLimits variant naming Open

help wanted

dtolnay/syn#1373 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve documentation for the `position` field of the `QSelf` type, which is difficult to understand. Open

docs

dtolnay/syn#1386 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`parse_nested_meta` docs: mention that error will be returned if closure doesn't parse non-path parts Open

docs

dtolnay/syn#1426 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Parse "return type notation" Open

syntax

dtolnay/syn#1434 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
allow `custom_keyword!` to support different struct name Open

dtolnay/syn#1507 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse `gen` blocks and functions Open

syntax

dtolnay/syn#1526 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Parse never patterns Open

syntax

dtolnay/syn#1546 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse function delegation syntax Open

syntax

dtolnay/syn#1580 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse async closures trait bound syntax Open

syntax

dtolnay/syn#1628 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Parse mutable by-reference bindings syntax Open

syntax

dtolnay/syn#1629 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse postfix match syntax Open

syntax

dtolnay/syn#1630 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse for-await syntax Open

syntax

dtolnay/syn#1631 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider inserting invisible groups, rather than parens, when applying grouping for precedence Open

breaking change

dtolnay/syn#1660 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Documentation discrepancy between `parse` and `parse2` Open

docs

dtolnay/syn#1723 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse unparenthesized half-open range patterns inside slice patterns Open

syntax

dtolnay/syn#1769 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse pinned type sugar Open

syntax

dtolnay/syn#1770 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider providing a `parse_file_with` function to support shebang-handling in preprocessors Open

dtolnay/syn#1781 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Feature request: recognize expressions from derive helper attributes w/o "full" parsing Open

dtolnay/syn#1782 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Parse unsafe fields Open

syntax

dtolnay/syn#1792 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse guard patterns Open

syntax

dtolnay/syn#1793 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse lightweight clones syntax Open

syntax

dtolnay/syn#1802 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Publish syn.json in some crate Open

dtolnay/syn#1803 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Request for contributor docs: Running tests Open

dtolnay/syn#1856 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Found slow units on syn::parse_str using cargofuzz Open

dtolnay/syn#1864 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Error::from_iter`: a convenient method for combining multiple errors Open

dtolnay/syn#1875 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Autogenerated source file causes stack overflow Open

dtolnay/syn#1876 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse `super let` syntax Open

syntax

dtolnay/syn#1889 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Parse postfix yield syntax Open

syntax

dtolnay/syn#1890 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse contracts syntax Open

syntax

dtolnay/syn#1892 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse frontmatter syntax Open

syntax

dtolnay/syn#1893 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Parse attributes inside of tuple types Open

syntax

dtolnay/syn#1919 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Reasonable way to less greedily parse an Expr? Open

dtolnay/syn#1950 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve panic messages when in `proc_macro` Open

dtolnay/syn#1957 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Add `token_final` field to `Signature` Open

dtolnay/syn#1961 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Weird error output when combining `syn::Error` in expression context Open

dtolnay/syn#1964 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Uninformative error from Attribute::parse_args for some expressions without "full" feature. Open

dtolnay/syn#1971 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Error parsing `const impl` Open

dtolnay/syn#1972 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Support parsing arms of `cfg_select!{}` Open

dtolnay/syn#1977 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dtolnay/syn

Get new issues in your inbox