Added pre-announcement of a new verion of Fun. No code changes. (0.40.5)

web/_posts/2026-04-17-announcing-fun-0.40.5.md

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+---
+layout: post
+published: true
+author: hanez
+author_email: you@hanez.org
+author_url: https://hanez.org
+noToc: false
+title: Announcing Fun 0.40.5
+description: Nested functions, Rust integration, and CI automation
+date: 2026-04-17
+date_updated: 2026-04-17 23:55:00
+categories:
+- news
+- project
+- release
+tags:
+- fun
+- programming
+- nested-functions
+- rust
+- automation
+---
+
+We are thrilled to announce the release of Fun version 0.40.5! This update represents a major leap forward in language capabilities, developer experience, and project infrastructure since our last major announcement (v0.37.62).
+
+### Key Highlights of Version 0.40.5
+
+#### Nested Functions & Higher-Order Patterns
+The most significant language enhancement is the addition of **nested functions** in the Fun parser. This allows for cleaner encapsulation and enables powerful functional programming patterns, such as closures and advanced higher-order function implementations.
+
+<pre>fun outer(x)
+  fun inner(y)
+    return x + y
+  return inner
+
+f = outer(10)
+print(f(5))  // 15</pre>
+
+#### Rust & C++ Integration
+Fun is getting more "multi-lingual." We've introduced support for implementing opcodes in **Rust**, allowing developers to leverage Rust's safety and performance within the Fun VM. Additionally, we've started evaluating C++ integration for those who need it.
+
+#### Improved Tooling: funstx
+We've introduced `funstx`, a dedicated linter for Fun. It helps maintain the "Indentation is Truth" philosophy by ensuring your code follows the strict 2-space indentation rule and other stylistic consistency checks.
+
+#### CI Automation & Reliability
+To ensure the stability of the language as it grows, we've implemented a full **GitHub Actions CI workflow**. Every commit now triggers automated execution of our extensive examples library, catching regressions early.
+
+#### VM Configuration & Performance
+The Fun VM is now more flexible than ever. Key parameters like `MAX_FRAMES`, `STACK_SIZE`, and `OUTPUT_SIZE` can now be configured at build time via CMake defines (`-D`), allowing you to tune the VM for specific environments (from embedded systems to beefy servers).
+
+### Changelog (v0.37.62 to v0.40.5)
+
+#### Added
+- Nested Functions - Full support in the parser (v0.40.0).
+- Rust Integration - Build and link Rust-based opcode libraries (v0.38.0).
+- GitHub Actions - CI Automated testing and example validation (v0.39.15).
+- Linter (funstx) - New tool to enforce code style and indentation (v0.39.0).
+- Configurable VM - Build-time tuning of memory limits via CMake (v0.40.5).
+- Specification v0.4 - Updated language specification.
+- New Stdlib Modules - AES256 support, improved asyncio/scheduler, and more.
+
+#### Changed
+- Documentation Relocation - All documentation moved to `./web/documentation/` for better website integration.
+- Website Overhaul - The website code was moved to `./web/` for easier maintenance.
+- Example Refactoring - Reorganized the `./examples` directory for better clarity and CI integration.
+- Code Style - Standardized all C files to two-space indentation.
+
+#### Removed (Cleanup & Focus)
+- Removed support for `libsql`, `tcltk`, `notcurses`, and `libressl` to streamline the core and focus on more modern alternatives (v0.40.2 - v0.40.5).
+
+#### Fixed
+- Improved line number reporting in error messages (v0.39.15).
+- Various bug fixes in the VM and standard library modules.
+
+### The Road to 1.0
+As always, Fun remains an experiment, but with version 0.40.5, we are closer than ever to a stable 1.0. We've focused on cleaning up experimental features that didn't fit our minimalism philosophy while adding the powerful primitives needed for real-world hacking.
+
+Want to try it out? Head over to our [Git Repository](https://git.xw3.org/fun/fun){:class="git"} or check out the updated [Documentation](/documentation/documentation.md).
+
+Happy hacking, and remember: **Fun is Fun!**
+
+Johannes Findeisen (hanez) - [hanez@fun-lang.xyz](mailto:hanez@fun-lang.xyz){:class="mail"}