Type erasure for async trait methods
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Realistic first-contribution target: active project, 276 open issues, small enough for a newcomer PR to land.
Derived from this repo's Cargo dependencies and activity — difficulty is an estimate from codebase size and scope.
Matched by dependency overlap in Cargo manifests — each card notes the most distinctive crates both projects share.
Type erasure for async trait methods
serde::Deserializer for proc_macro/proc_macro2::TokenStream
Utilities for working with impl traits in Rust.
Procedural macro for bitfields.
A Rust crate that implements "design by contract" via procedural macros
Analysis of various tricky Rust code
Lattice // Salt // Facet
Single-pass SSA compiler and bytecode VM for a sandboxed Python subset. NaN-boxed values, dual inline caching (scalar + instance-dunder), super-instruction fusion, pure-function memoization, mark-sweep GC; classes with inheritance and dunder protocol, stackful coroutines with async/await, pattern matching, and packages.json imports. <200 KB WASM.
Trait implementation generator macro
derive(Error) for struct and enum error types