v0.1.0-next

This release introduces explicit mutability, a unified function and closure syntax, first-class type hints with is/switch matching, and dedicated keywords for attributes and declarations. Together these changes significantly reshape the language surface from v0.0.1.

Breaking Changes

• module keyword renamed to mod.
• let replaced by const (immutable) and var (mutable). Migrate existing let declarations to const.
• func keyword renamed to fn. Closures changed from func name { args -> body } and { args -> body } to fn name(args) { body } and fn(args) { body }.

Implemented Proposals

• ZE-001 Base Language — Core language: declarations, expressions, operators, control flow, modules, imports, literals, and attributes.
• ZE-011 Zirric CLI — Single zirric binary with run, repl, lsp, init, install, task management, and project commands.
• ZE-013 Mutability and Constants — Replace let with const and var for explicit mutability. Upvalue-based closure captures.
• ZE-014 Attribute and Declaration Keywords — Dedicated attr keyword and mandatory parentheses for attribute application.
• ZE-016 Unified Function and Closure Syntax — Closures use fn(params) { body }, unifying named and anonymous function syntax.
• ZE-017 Type Hints and Type Matching — First-class type hints (: T, -> T), composite type expressions ([T], [K: V], fn() -> R), is type checking, and switch type matching.
• ZE-008 Error Handling — Standardized Result and AnyResult union types for failure-aware APIs in prelude/result.zirr.
• ZE-009 Option Values — Standard Optional type for values that may be present or absent, defined in prelude/result.zirr.
• ZE-018 I/O, Formatting, and OS — New io, fmt, and os standard library modules for byte streams, text formatting/printing, and OS interaction (stdout, stdin, stderr, exit, env, args).

Tooling

• Update Tree-Sitter-Zirric to v0.4.0 and update your queries as described in Editor Support.
• Language documentation is now available at zirric.knabel.dev.
• The Zirric Language Server (zirric lsp) provides diagnostics, go-to-definition, and basic completions for editors.

Check out the full changelog on code.knabel.dev/zirric-lang/zirric.