NomicFoundation/slang

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Solidity compiler tooling by @NomicFoundation

Is NomicFoundation/slang beginner-friendly?

In the last 30 days, NomicFoundation/slang merged 40 of 50 pull requests from outside contributors, and its maintainers usually reply within 4 days. 1 beginner-friendly issue is open now.

Stars: 287
Forks: 50
Open beginner issues: 1
Indexed issues: 94
Avg merge: 5d 15h
Merged PRs (30d): 64

Dominant language: Rust
License: MIT
Last GitHub push: Nov 2, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

How to contribute to NomicFoundation/slang

Read the contributing guide first: it says how the maintainers want changes proposed, tested and reviewed.
The project ships a dev container: open it in Codespaces to get a working environment in your browser.
Your contributions will be published under the project's MIT license.
Pick the open beginner-friendly issue below and comment that you want to work on it before you start.

Beginner friendly Everything

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Issues somebody may already be working on are listed last. List everything by date

ICE: Index access on `string`
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 52/100

NomicFoundation/slang#2341 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
A library name is accepted as a type, `public` panics the compiler
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 48/100

NomicFoundation/slang#2340 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
A `memory` receiver matches `calldata self` of an internal function
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

NomicFoundation/slang#2339 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
`string` has a `length` member
Open
- Is something wrong?
Difficulty 4/5 1-2 days Newbie friendliness 50/100

NomicFoundation/slang#2338 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
String literal matches `bytes calldata`: valid call is ambiguous
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 30/100

NomicFoundation/slang#2337 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
Yul number above 256 bits panics the compiler
Open
- Is something wrong?
Difficulty 2/5 Half a day Newbie friendliness 65/100

NomicFoundation/slang#2336 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
Yul string above 32 bytes is accepted and cut to 32 bytes
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 60/100

NomicFoundation/slang#2335 · Opened Nov 2, 2026

Maintainers usually reply within 4 days
`transient` mapping is accepted and persists across transactions
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 52/100

NomicFoundation/slang#2332 · Opened Nov 1, 2026

Maintainers usually reply within 4 days
`bytesN.length` is typed `uint256`, rejecting a valid overload call
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 45/100

NomicFoundation/slang#2331 · Opened Nov 1, 2026

Maintainers usually reply within 4 days
`type U is string;` is accepted
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

NomicFoundation/slang#2330 · Opened Nov 1, 2026

Maintainers usually reply within 4 days
[v2] A `storage` argument also matches a `calldata` overload
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 66/100

NomicFoundation/slang#2311 · Opened Oct 23, 2026

Maintainers usually reply within 4 days
[v2] `C.f.selector` through a contract's type name sees its private overloads
Open
- Is something wrong?
bug

Difficulty 4/5 1-2 days Newbie friendliness 56/100

NomicFoundation/slang#2310 · Opened Oct 23, 2026

Maintainers usually reply within 4 days
[v2] `using L for T` attaches L's private functions
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

NomicFoundation/slang#2309 · Opened Oct 23, 2026

Maintainers usually reply within 4 days
[v2] `using {f as *} for T global` also attaches `f` as a member
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

NomicFoundation/slang#2308 · Opened Oct 23, 2026

Maintainers usually reply within 4 days
[v2] An override that changes a parameter's data location stays a separate candidate before 0.8.14
Open
- Is something wrong?
bug

Difficulty 4/5 1-2 days Newbie friendliness 57/100

NomicFoundation/slang#2307 · Opened Oct 23, 2026

Maintainers usually reply within 4 days
Stricter diagnostics on v2
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

NomicFoundation/slang#2304 · Opened Oct 20, 2026

Maintainers usually reply within 4 days
[v2] A public state variable's getter is not found next to an inherited function of the same name
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

NomicFoundation/slang#2261 · Opened Oct 9, 2026

Maintainers usually reply within 4 days
[v2] `using L for function(...) internal` does not attach to a private function
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

NomicFoundation/slang#2259 · Opened Oct 9, 2026

Maintainers usually reply within 4 days
[v2] An array literal of internal functions does not select an overload
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 40/100

NomicFoundation/slang#2257 · Opened Oct 9, 2026

Maintainers usually reply within 4 days
[v2] abi.decode types a decoded address as address, but solc types it as address payable
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

NomicFoundation/slang#2253 · Opened Oct 9, 2026

Maintainers usually reply within 4 days
[v2] Context aware IR provider
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 30/100

NomicFoundation/slang#2206 · 1 comment · Opened Sep 28, 2026

Maintainers usually reply within 4 days
[v2] An array literal's element type keeps its component's data location
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

NomicFoundation/slang#2197 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] A constant imported by name through two routes is ambiguous inside assembly
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

NomicFoundation/slang#2195 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Names hidden by solc's per-import snapshot inside import cycles are reported as identifier-redeclaration
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

NomicFoundation/slang#2194 · 1 comment · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Builtin namespace as a tuple component in an expression statement is rejected
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

NomicFoundation/slang#2193 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Duplicate indexed on an event parameter is a parse error, but solc before 0.8.18 accepts it
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 70/100

NomicFoundation/slang#2192 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Conditional has no common type for function types that differ in both visibility and mutability
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

NomicFoundation/slang#2191 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Conditional whose branches are tuple assignments of different arity has no common type
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

NomicFoundation/slang#2190 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Conditional has no common type for fixed-size arrays of reference elements across data locations
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

NomicFoundation/slang#2189 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] Override checks apply solc 0.8.12 semantics to 0.8.8–0.8.11
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

NomicFoundation/slang#2188 · Opened Sep 25, 2026

Maintainers usually reply within 4 days
[v2] String literal shorter than N does not select a bytesN overload
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

NomicFoundation/slang#2182 · Opened Sep 24, 2026

Maintainers usually reply within 4 days
[v2] `super.f` resolves to unimplemented base functions
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

NomicFoundation/slang#2148 · Opened Sep 14, 2026

Maintainers usually reply within 4 days
[v2] Bare call to a public function accepts `memory` for `calldata`
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 54/100

NomicFoundation/slang#2147 · Opened Sep 14, 2026

Maintainers usually reply within 4 days
[v2] ABI: library function parameters keep contract, interface and enum types by name in solc's JSON `type`
Open
- Is something wrong?
rust

Difficulty 3/5 1-2 days Newbie friendliness 58/100

NomicFoundation/slang#2130 · Opened Sep 13, 2026

Maintainers usually reply within 4 days
Implicitly convert any type to `Void`
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

NomicFoundation/slang#1971 · Opened Jul 24, 2026

Maintainers usually reply within 4 days
re-use `default_import_closure` for identifier redefinition checking
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

NomicFoundation/slang#1956 · Opened Jul 20, 2026

Maintainers usually reply within 4 days
ABI entries for generated getters are missing parameter name information
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

NomicFoundation/slang#1891 · Opened Jun 24, 2026

Maintainers usually reply within 4 days
Improve parsing errors by merging related terminals and constructs
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

NomicFoundation/slang#1853 · 1 reaction · Opened Jun 12, 2026

Maintainers usually reply within 4 days
Get rid of `UserMetaType` in favour of `MetaType`
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

NomicFoundation/slang#1839 · 2 comments · Opened Jun 8, 2026

Maintainers usually reply within 4 days
Register (some) terminal types on the type registry
May be free again @teofr claimed this 151 days ago, and no pull request is open. Open
- Is something wrong?
NomicFoundation/slang#1829 · 1 assignee · Opened Jun 4, 2026

Maintainers usually reply within 4 days
bencher start point doesn't consider merge of PR branch
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

NomicFoundation/slang#1718 · Opened Apr 22, 2026

Maintainers usually reply within 4 days
Migrate perf benchmarks from iai-callgrind to gungraun
May be free again @teofr claimed this 201 days ago, and no pull request is open. Open
- Is something wrong?
NomicFoundation/slang#1690 · 1 comment · 1 assignee · Opened Apr 15, 2026

Maintainers usually reply within 4 days
[v2] make sure `structured_cst` includes all relevant terminals
May be free again @teofr claimed this 207 days ago, and no pull request is open. Open
- Is something wrong?
NomicFoundation/slang#1654 · 1 assignee · Opened Apr 9, 2026

Maintainers usually reply within 4 days
Evaluate migration from MkDocs to ProperDocs or Zensical
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

NomicFoundation/slang#1623 · Opened Apr 7, 2026

Maintainers usually reply within 4 days
[V2] Validate version pragmas
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

NomicFoundation/slang#1598 · 1 reaction · Opened Apr 2, 2026

Maintainers usually reply within 4 days
[v1] Parser can't handle non-keyword names on state variables
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 62/100

NomicFoundation/slang#1582 · Opened Mar 26, 2026

Maintainers usually reply within 4 days
Refactor sourcify testing, make them regular tests
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

NomicFoundation/slang#1581 · Opened Mar 26, 2026

Maintainers usually reply within 4 days
[v1] Parser can't handle multiple attributes correctly in function state variables
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 72/100

NomicFoundation/slang#1578 · Opened Mar 26, 2026

Maintainers usually reply within 4 days
Upgrade `ariadne` once new release lands
May be free again A pull request for this issue was closed without being merged. Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 52/100

NomicFoundation/slang#1536 · 2 comments · 1 reaction · Opened Mar 3, 2026

Maintainers usually reply within 4 days
Add more extensive testing for ABI output and function selectors
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

NomicFoundation/slang#1517 · 2 comments · Opened Jan 30, 2026

Maintainers usually reply within 4 days

NomicFoundation/slang

Is NomicFoundation/slang beginner-friendly?

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