Slang is a Rust‑based toolkit that parses Solidity source code into full‑fidelity concrete syntax trees (CSTs) and provides high‑level APIs (parsers, cursors, queries, and binding graphs) for semantic analysis across multiple Solidity compiler versions. It’s aimed at developers building Solidity analysis, linting, formatting, or upgrade‑tooling (e.g., Hardhat VSCode extension, Prettier plugin, OpenZeppelin upgrades), offering a language‑agnostic library via npm, Cargo, and other bindings.