slovo/.llm/BETA_4_LANGUAGE_USABILITY.md

Beta 4 Language Usability

Scope

This post-1.0.0-beta.3 slice reduces friction in ordinary project use without changing the typed core or claiming new syntax stability.

Current Work

• Improve project/workspace build and run entry diagnostics.
• Keep the accepted entry contract unchanged: (fn main () -> i32 ...).
• Use precise diagnostic codes for missing and invalid entry main functions.
• Make non-exhaustive match diagnostics clearer and deterministic.

Acceptance Gates

• cargo test --test project_mode entry_main
• cargo test --test diagnostics_contract
• cargo fmt --check
• git diff --check

Deferrals

• No implicit main return conversions.
• No argument-taking main.
• No async, package registry, or stable ABI/layout promises.
• Broader type aliases, match diagnostics, and destructuring remain candidate follow-up items in the same language usability roadmap lane.