Adds spread operator for records, allowing concise record updates:
let p2 = { ...p, x: 5.0 }
Changes across the full pipeline:
- Lexer: new DotDotDot (...) token
- AST: optional spread field on Record variant
- Parser: detect ... at start of record expression
- Typechecker: merge spread record fields with explicit overrides
- Interpreter: evaluate spread, overlay explicit fields
- JS backend: emit native JS spread syntax
- C backend: copy spread into temp, assign overrides
- Formatter, linter, LSP, symbol table: propagate spread
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Tuple index: `pair.0`, `pair.1` syntax across parser, typechecker,
interpreter, C/JS backends, formatter, linter, and symbol table
- Multi-line function args: allow newlines inside argument lists
- Fix effect unification for callback parameters (empty expected
effects means "no constraint", not "must be pure")
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implements a linter with 21 lint rules across 6 categories (correctness,
suspicious, idiom, performance, style, pedantic). Lux-specific lints include
could-be-pure, could-be-total, unnecessary-effect-decl, and single-arm-match.
Integrates lints into `lux check` for unified type+lint checking. Available
standalone via `lux lint` (alias: `lux l`) with --explain for detailed help.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
