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Greyalien Roadmap (Prototype)

This roadmap focuses on the Python interpreter subset and its supporting docs. For long-term direction, see GREYALIEN_VISION.md. For the conceptual language design, see SPEC.md.

Scope and versioning

  • v0.x is a prototype subset. Semantics and syntax can change as the spec evolves.
  • The goal is correctness, clarity, and teachable error messages over speed.
  • Each milestone should keep SPEC_V0.md aligned with the interpreter.

v0.2 goals (target)

P0 (must)

  • Records and field access: {x: 1} and p.x with parser, interpreter, and type checker support, plus SPEC_V0.md updates.
  • Ownership and borrowing draft in SPEC.md that defines core terms and rules.
  • Effects system sketch in SPEC.md covering purity and IO at a minimum.
  • Canonical examples with golden outputs and tests that verify them.

P1 (should, if time)

  • List literals and indexing with clear runtime bounds errors and type checks.
  • Runtime errors include line/column spans with snippet context.
  • Parser error recovery for common mistakes (missing semicolons, braces).

Non-goals for v0.2

  • Full ownership/borrow checker implementation.
  • Effects implementation or effect handlers.
  • Optimizing native compiler, LSP, or package manager.
  • Standard library beyond the current print built-in.

Success criteria

  • make test passes on CI and locally.
  • SPEC_V0.md matches the interpreter behavior for all v0.2 features.
  • At least five examples ship with expected outputs.