Incan v0.2.0

Incan 0.2

Incan 0.2 is the release where the language becomes more explicit, more modular, and much more serious about Rust interop.

The biggest user-facing shift is that stdlib imports and decorators now live under the std.* namespace. This release also introduces the first experimental Incan library workflow, module-level static storage, explicit call-site generic arguments, and a much stronger Rust boundary around crates, rust:: imports, rusttype, and interop authoring.

Highlights

• Namespaced stdlib surface under std.*
• Clear separation between Incan dependencies and Rust dependencies in incan.toml
• Experimental Incan Libraries with pub:: consumption
• New static / pub static module storage
• Explicit call-site generic arguments like id[int](1)
• Stronger Rust interop and better docs around rust::, rusttype, and interop adapters
• Major stabilization across ownership/codegen, tuple-unpack iteration, test harness cwd handling, and real downstream RC regressions

Migration notes

If you are upgrading from 0.1, the main changes are:

1. Move stdlib imports and decorators to std.*
2. Move Rust crates out of [dependencies] into [rust-dependencies] / [rust-dev-dependencies]
3. Add explicit std.async / std.testing imports in files that use those surfaces

Notable fixes from the 0.2 RC cycle

• Ownership/materialization fixes across comprehensions, Result[str, E], struct cloning, enum loops, shared list[str] helper calls, and list[str].append("...")
• Stronger Python-shaped iteration and pattern handling, including for idx, name in enumerate(xs):
• Builtin shadowing fixes for imported/user helpers such as sum
• Correct project-root cwd behavior in generated incan test harnesses
• Parse-safe len(...) lowering in generated Rust comparisons

Known limitations

• Ownership/borrow lowering is still heuristic in some edge cases; the broader planner work is tracked for 0.3
• incan fmt is still intentionally conservative on some line-length and layout cases
• Rust macro syntax such as serde_json::json!(...) is still not supported directly in Incan source

Docs

Start here if you want the full release write-up and migration guide:

• workspaces/docs-site/docs/release_notes/0_2.md