dang

Dang language reference for writing, editing, and reviewing `.dang` code — syntax, types/nullability, prototype objects, copy-on-write mutation, control flow, errors, GraphQL interop, stdlib, and CLI. Use when authoring or reviewing `.dang` files or Dang modules, or any time precise Dang language behavior matters.

How to add or modify builtin functions and methods in `pkg/dang/stdlib.go`. Use when extending Dang's standard library.

Non-obvious invariants in Dang's compiler — multi-pass hoisting, the Fork/Clone/dynamic-scope-cell model, and `Module.Eq` subtyping. Use when editing `pkg/dang/` infer/eval/scope code, adding a new type-like declaration, or debugging mutation/scoping issues.

How to maintain editor syntax definitions for Dang. Use when adding or removing keywords, tokens, or language constructs.

How to run tests, add error tests, update golden files, and report nice errors in Dang. Use when running or writing tests.