This repository is the official language standard and conformance suite for Dhall, a programmable, non-Turing-complete configuration language. It is not a deployable application or library in the traditional sense; instead, it contains the authoritative formal specification: literate Haskell modules defining syntax, alpha-normalization, capture-avoiding substitution, beta-normalization, type inference, and CBOR binary encoding. The complete ABNF grammar and the reference parser provide ground truth for every Dhall implementation, while the versioned Prelude directory constitutes the standard library published at prelude.dhall-lang.org. The repo also includes Nix-based infrastructure for building docs, running CI, and hosting the project's own services, but the core value is the specification and its cross-implementation test corpus.
MiniRust is a formal specification of an idealized subset of Rust, known as MiniRust, with an executable model defined in a custom specification language (specr). The repository provides tooling that translates real Rust MIR (via rustc) into MiniRust and runs it through a reference interpreter. It includes a comprehensive test suite (minitest) covering pass, panic, and undefined behavior scenarios, along with utilities for program construction and pretty-printing. The work is squarely a formal-semantics research project, not a production application. It models pointer provenance, aliasing (Tree Borrows), concurrency, and data-race detection, and is primarily used to validate the Rust memory model. The codebase is well-structured with clean abstractions (pluggable memory model, builder API) but depends heavily on unstable rustc internals and has many incomplete features (e.g., floats, operators, casts).