Nimblesite/osprey

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A modern functional programming language designed for elegance, safety, and performance. Written in Rust, outputs to LLVM.

Is Nimblesite/osprey beginner-friendly?

The maintainers of Nimblesite/osprey usually reply to a pull request within 1 day. No beginner-friendly issue is open right now; the list below has the other issues we hold for it.

Stars: 71
Forks: 6
Open beginner issues: 0
Indexed issues: 135
Avg merge: 8h 7m
Merged PRs (30d): 37

Dominant language: C
License: No license data
Last GitHub push: Nov 4, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

How to contribute to Nimblesite/osprey

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.
Follow the repository to hear when a new beginner-friendly issue opens, or look through the other issues below.

Beginner friendly Everything

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

No hover on tuple-style parameters of ML-flavor functions
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Nimblesite/osprey#372 · Opened Nov 7, 2026

Maintainers usually reply within 1 day
Compiler error modes: fastfail (default), all messages, yolo (explicit opt-in)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/osprey#371 · Opened Nov 7, 2026

Maintainers usually reply within 1 day
Synth suite fails unless run from the repo root: signal_flow's default machine path is cwd-relative
Open
- Is something wrong?
bug

Difficulty 2/5 1-3 hours Newbie friendliness 80/100

Nimblesite/osprey#370 · Opened Nov 7, 2026

Maintainers usually reply within 1 day
Windows GC: GPU stress 'zero and empty buffers' gets a garbage buffer length on runner image 20261103
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

Nimblesite/osprey#368 · 1 comment · Opened Nov 6, 2026

Maintainers usually reply within 1 day
GPT-2 cross-flavor parity test runs in no CI job
Open
- Is something wrong?
bug

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

Nimblesite/osprey#366 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
ML parser: pipe target with type arguments loses the pipe; binder without signature gives an unrelated parse error
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 57/100

Nimblesite/osprey#365 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Python flavor: assigning an outer name inside a handler arm silently creates a local
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 46/100

Nimblesite/osprey#364 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Deep non-tail recursion segfaults (exit 139) with no diagnostic
Open
- Is something wrong?
bug

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

Nimblesite/osprey#363 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Compiler overflows its stack (exit 134) on deeply nested expressions
Open
- Is something wrong?
bug

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

Nimblesite/osprey#362 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
HTTP client has no total deadline for the TLS handshake and request
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 65/100

Nimblesite/osprey#361 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
WebSocket frame parser rejects 64-bit lengths and ignores FIN and opcodes
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 47/100

Nimblesite/osprey#360 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
spawn returns a negative handle when fiber tables are exhausted
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 46/100

Nimblesite/osprey#359 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Channel(0) aborts the process with exit 134 instead of returning an error
Open
- Is something wrong?
bug

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

Nimblesite/osprey#358 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Metal: a named GPU helper reads the kernel lambda's parameter instead of its captured binding (wrong answer)
Open
- Is something wrong?
bug critical

Difficulty 4/5 3-5 days Newbie friendliness 62/100

Nimblesite/osprey#357 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Windows GC never scans data/BSS roots, so memory referenced only from a global can be freed
Open
- Is something wrong?
bug critical

Difficulty 4/5 3-5 days Newbie friendliness 58/100

Nimblesite/osprey#356 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Native store writes escape the store through intermediate symlinks (Swift and WinUI hosts)
Open
- Is something wrong?
bug critical

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

Nimblesite/osprey#355 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
HTTP externs changed int to Result in #337 with no migration path
Open
- Is something wrong?
bug

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

Nimblesite/osprey#353 · 1 comment · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Test loosening since v0.28.2: self-referential hover check, 5 s mask poll, deleted profiler provenance test
Open
- Is something wrong?
bug

Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#352 · 1 comment · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: low-severity runtime and package items (shell interpolation, SIGPIPE, dead abort export)
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 43/100

Nimblesite/osprey#351 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
FastAPI and Python-flavor package parity: remaining acceptance work
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 18/100

Nimblesite/osprey#350 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: duplication measurement gaps (deslop 0.40.1, C runtime, ML parse failures)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#349 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: CI reliability and cost (Android emulator, cancellation, slow tests)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 42/100

Nimblesite/osprey#348 · 1 comment · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: proof kernel and plan 0041 open records
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 20/100

Nimblesite/osprey#347 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: GPU and staged-effects spec and coverage gaps
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 20/100

Nimblesite/osprey#346 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
Review: language, type and LSP gaps (non-critical)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

Nimblesite/osprey#345 · Opened Nov 6, 2026

Maintainers usually reply within 1 day
VS Code native editor focus fails on macOS; CI only runs the suite on Linux
Open
- Is something wrong?
bug critical showstopper

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

Nimblesite/osprey#344 · 1 comment · Opened Nov 6, 2026

Maintainers usually reply within 1 day
FastAPI JSON bodies fail when encoded as UTF-16 or UTF-32
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/osprey#342 · Opened Nov 5, 2026

Maintainers usually reply within 1 day
Hunt skip list HUNT_UNPORTABLE.txt is unverified: entries are stale and nothing fails
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 67/100

Nimblesite/osprey#341 · Opened Nov 4, 2026

Maintainers usually reply within 1 day
Recursive function awaiting a Fiber parameter fails codegen after passing --check (breaks examples/tui/api_browser.osp and make _tui)
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 56/100

Nimblesite/osprey#340 · Opened Nov 4, 2026

Maintainers usually reply within 1 day
Typechecked Facts.get workflow fails generic-closure codegen; nominal caller boundaries unblock six cases
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 38/100

Nimblesite/osprey#329 · Opened Oct 31, 2026

Maintainers usually reply within 1 day
Provide an opt-in fail-on-warnings analyzer mode for CI
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 54/100

Nimblesite/osprey#328 · Opened Oct 31, 2026

Maintainers usually reply within 1 day
v0.23.0: module-level record update reports unknown identifier; local alias passes GC/ARC
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

Nimblesite/osprey#326 · Opened Oct 30, 2026

Maintainers usually reply within 1 day
Lambda inside string interpolation is lexed as an escape sequence (\row becomes ow)
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 67/100

Nimblesite/osprey#323 · Opened Oct 27, 2026

Maintainers usually reply within 1 day
v0.23.0 Mac ABI: partial collection comparison segfaults with inferred Section helper; nominal signature avoids crash
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#320 · Opened Oct 27, 2026

Maintainers usually reply within 1 day
Native host string imports need a bounded ownership contract for long-running ARC clients
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 18/100

Nimblesite/osprey#318 · Opened Oct 26, 2026

Maintainers usually reply within 1 day
v0.23.0: inferred structural-row formatting crashes in consumer GC and Apple ARC
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#317 · Opened Oct 26, 2026

Maintainers usually reply within 1 day
Redundant-annotation warning pass costs one whole-program solve per annotation site (31 min on packages/manager/cli)
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 12/100

Nimblesite/osprey#309 · 3 comments · Opened Oct 26, 2026

Maintainers usually reply within 1 day
Infra: pre-receive hook declines every git push (single-commit and new-branch pushes included); REST API writes work
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 22/100

Nimblesite/osprey#308 · Opened Oct 26, 2026

Maintainers usually reply within 1 day
Hunt: GC root instrumentation refuses 47/215 corpus programs (unsupported stack control); ARC explores them fine
Open
- Is something wrong?
bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

Nimblesite/osprey#307 · Opened Oct 26, 2026

Maintainers usually reply within 1 day
Hunt: clean.osp never completes inside the pinned 64-byte/30s gate on either backend (symbolic integer print path)
Open
- Is something wrong?
bug critical

Difficulty 5/5 Over a week Newbie friendliness 12/100

Nimblesite/osprey#306 · Opened Oct 26, 2026

Maintainers usually reply within 1 day
Official 0.22.0 macOS installation lacks the runtime archive required by --target=macos
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/osprey#303 · Opened Oct 25, 2026

Maintainers usually reply within 1 day
Parse expressions inside interpolated strings in the tree-sitter grammar
Open
- Is something wrong?
bug

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

Nimblesite/osprey#301 · Opened Oct 25, 2026

Maintainers usually reply within 1 day
Coverage misses the first line of a function run only through a function value from another file
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/osprey#296 · 1 comment · Opened Oct 24, 2026

Maintainers usually reply within 1 day
A record update with a list literal of records segfaults at runtime
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 45/100

Nimblesite/osprey#293 · Opened Oct 24, 2026

Maintainers usually reply within 1 day
Compiler hangs indefinitely (no output, flat memory) on --run after adding forward module reference and new record helper
Open
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Difficulty 4/5 3-5 days Newbie friendliness 46/100

Nimblesite/osprey#288 · 2 comments · Opened Oct 24, 2026

Maintainers usually reply within 1 day
A function that calls one defined later is not generalized
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 45/100

Nimblesite/osprey#287 · Opened Oct 23, 2026

Maintainers usually reply within 1 day
Derive changed signal identities from static Signal handler values
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#286 · Opened Oct 23, 2026

Maintainers usually reply within 1 day
Std signals: built-in Signal<T>, retained frame cache, change identities and keyed refresh
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 30/100

Nimblesite/osprey#285 · Opened Oct 23, 2026

Maintainers usually reply within 1 day
No way to name the signalRefresh snapshot record in a signature: a nominal record type does not unify with the structural { dependencies, revision, value }
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

Nimblesite/osprey#284 · Opened Oct 23, 2026

Maintainers usually reply within 1 day
Codegen: closure passed to a generic function inside a nested match stage is 'still generic' although every type is concrete
Open
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Difficulty 4/5 1-2 days Newbie friendliness 47/100

Nimblesite/osprey#283 · Opened Oct 23, 2026

Maintainers usually reply within 1 day

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