cryspen/hax

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A Rust verification tool

Stars: 480
Forks: 70
Open beginner issues: 0
Indexed issues: 230
Avg merge: 2d 5h
Merged PRs (30d): 59

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted

Open All

230 open issues indexed

`while let .. = .. {}` Open

engine good first issue help wanted keep-open unsupported-rust

cryspen/hax#113 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Attributes: deduplicate parent attributes Open

frontend good first issue help wanted keep-open P2

cryspen/hax#123 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`loop {...}` (when not a `for` or `while`) Open

backend engine good first issue keep-open unsupported-rust

cryspen/hax#124 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Deprecate and remove support for recovering macro call infos Open

backend frontend keep-open lib needs-triage

cryspen/hax#145 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support `let` without initialization Open

engine help wanted keep-open marked-unimplemented unsupported-rust

cryspen/hax#156 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
When hax-engine's fails to parse stdin, make nicer error message Open

cli engine good first issue

cryspen/hax#218 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Engine: import thir: investigate `Use` ident Open

engine needs-info

cryspen/hax#272 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Equality constraints meta issue Open

engine f* frontend meta needs-triage

cryspen/hax#322 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[Meta] ProVerif backend tracking issue Open

keep-open meta

cryspen/hax#382 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
F*: interface mode: missed binders Open

bug f* keep-open

cryspen/hax#402 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unsupported: implicit reborrowing Open

keep-open unsupported-rust wontfix-v1

cryspen/hax#419 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mutable references (`&mut T`) with complex aliasing (meta-issue) Open

keep-open meta unsupported-rust wontfix-v1

cryspen/hax#420 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mutation through `Deref`/`DerefMut` traits Open

bug engine keep-open unsupported-rust

cryspen/hax#491 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mutation of enum variants Open

keep-open unsupported-rust wontfix-v1

cryspen/hax#493 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Core library: support more `&mut`-returning functions Open

keep-open unsupported-rust wontfix-v1

cryspen/hax#494 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
CLI: improve `hax into -i '...'` Open

cli needs-design

cryspen/hax#497 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[F* backend] Associated types are not extracted correctly in general Open

backend f* marked-unimplemented

cryspen/hax#549 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
New backend: Cryptoverif Open

backend generic-printer keep-open

cryspen/hax#601 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Makefile error: Identifier not found: [Core.Iter.Traits.Iterator.f_position] Open

keep-open proof-lib

cryspen/hax#603 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Merging Hax and Charon Open

keep-open meta

cryspen/hax#678 · 4 comments · 2 reactions · 2 assignees · Indexed Sep 15, 2026
Engine crashes on refinement types with wildcard as binder Open

backend easy-fix engine f* lib

cryspen/hax#760 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Book: add F* quickstart Open

book documentation f* install keep-open

cryspen/hax#766 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Engine: F*: option to extract opaque interfaces for impls Open

engine enhancement f* keep-open

cryspen/hax#768 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Pre/post `&mut` argument: remove `future` in favor of `old` Open

engine enhancement needs-triage

cryspen/hax#773 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Engine: Error reporting with `NotImplementedYet` items Open

engine enhancement

cryspen/hax#775 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`hax_lib::attributes`: impls: `requires` clause not available in `ensures` Open

attributes enhancement f* keep-open workaround

cryspen/hax#784 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Document the mechanisms of feature Open

documentation engine keep-open

cryspen/hax#786 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add support for `dyn` in backends Open

backend f* lean

cryspen/hax#787 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`requires` and `ensure` clauses on traits: add inheritance Open

attributes engine enhancement keep-open

cryspen/hax#789 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Array/Slice Patterns are not supported Open

engine keep-open marked-unimplemented unsupported-rust

cryspen/hax#804 · 0 comments · 3 reactions · 1 assignee · Indexed Sep 15, 2026
`match`s simplification phases Open

engine enhancement keep-open meta needs-triage

cryspen/hax#806 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Make names of `impl` more stable Open

engine enhancement lib workaround

cryspen/hax#828 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`ensures`/`requires` on traits and impls: better ergonomics Open

enhancement lib

cryspen/hax#829 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Phase to desugar as patterns (`x @ subpattern`) Open

engine enhancement unsupported-rust

cryspen/hax#833 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support `PartialOrd` and other generated things Open

engine

cryspen/hax#837 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Better loop invariants Open

engine enhancement needs-discussion

cryspen/hax#858 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Reference an `&mut _` binder in `fstar!` inside loop invariant Open

bug f* lib

cryspen/hax#861 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add automatic invariants for functions with `&mut` inputs Open

enhancement

cryspen/hax#869 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Frontend: support nightly feature `generic_const_exprs` Open

enhancement frontend keep-open unsupported-rust

cryspen/hax#871 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support default methods Open

backend enhancement f* lean

cryspen/hax#888 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`#[hax_lib::lemma]` in traits Open

lib

cryspen/hax#890 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`hax_lib::fstar::options!`: accept `interface`/`both`/`impl` Open

enhancement lib

cryspen/hax#896 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Cannot access previous struct fields in `refine` attributes Open

bug frontend lib

cryspen/hax#904 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F* typechecking fails when introducing an unused variable in `forall` Open

f* lib workaround

cryspen/hax#905 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support multiple dependencies on the same extern crate Open

engine keep-open wontfix-v1

cryspen/hax#911 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Engine (`side_effect_utils`): bug in presence of nested returns and `&mut` input Open

bug engine

cryspen/hax#912 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Frontend: add support for `GAT`s Open

frontend keep-open unsupported-rust

cryspen/hax#915 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unsupported Rust: `const` inline blocks Open

engine keep-open marked-unimplemented unsupported-rust

cryspen/hax#923 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Unsupported Rust: coroutines (nightly) or async (stable) Open

keep-open marked-unimplemented unsupported-rust

cryspen/hax#924 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unsupported Rust: range patterns Open

keep-open marked-unimplemented unsupported-rust

cryspen/hax#925 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026

cryspen/hax

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