Add 2025-10: Undefined Rust

Author: Florob

_posts/2025-10-01-unsafe.md

@@ -0,0 +1,48 @@
+---
+title: "Rust in October: Undefined Rust"
+date: 2025-10-01 19:15:00 MESZ
+categories: meetup cologne
+links:
+    "Meetup.com": "https://www.meetup.com/rustcologne/events/311209846/"
+    "Planning discussion on Github": "https://github.com/Rustaceans/rust-cologne/issues/134"
+location: c4
+talks:
+- title: "Rust Undefined Behavior"
+  speaker:
+    name: "Florian Zeitz"
+    github: florob
+  abstract: |
+    Undefined behavior and the nasal demons it invokes are a problem in many systems programming
+    languages. Rust is virtually free of it in its safe subset. However, the unsafe subset can
+    still invoke undefined behavior. This talk will explore how (unsafe) Rust compares to C in terms
+    of its undefined behavior.
+  slides: "https://babelmonkeys.de/~florob/talks/RC-2025-10-01-unsafe-undefined.pdf"
+---
+
+Rust Cologne is a monthly meetup dealing with everything Rust.
+In our next meetup we will talk about the Rust 1.90 release and learn about undefined behavior
+especially pertaining to safe and unsafe Rust.
+
+_(The meetup will likely be held in German but we'll switch to English if needed.)_
+
+Dear Rustacean,
+
+you are hereby warmly invited to join the next Rust Cologne meetup. Whether you want to speed up your python code, write a web service, need interop with your C++-codebase, cross-compile for a microcontroller, write an emulator, … we've got you covered!
+
+We commonly open up with a brief summary of noteworthy changes in the Rust ecosystem. Be it updates to the language itself, public events, its impact on other projects and languages, …
+
+At this meetup we first take a look at the changes in the [Rust 1.90 release](https://blog.rust-lang.org/2025/09/18/Rust-1.90.0/).
+Following that we will learn about undefined behavior, how it influences the arcane art of writing unsafe Rust and how to avoid it.
+
+As usual, the remaining time is about whatever _you_ want to talk about!
+
+Always wanted to know why Rust is harder to learn than other popular languages or why it lacks a certain feature? When is it appropriate to rewrite a project in Rust? Is the compiler really that slow and are the binaries really that big? Do all those safety guarantees have an impact on the performance? Fetch a drink and let's find out.
+
+**[You can register here](https://www.meetup.com/rustcologne/events/311209846/)**.
+
+See you soon!
+
+Yours,
+Florian and Kai
+- - -
+If you have a topic you'd like to talk about, please [let us know in advance](https://github.com/Rustaceans/rust-cologne/issues/134). This way we can make sure there's a time-slot for you and maybe announce it officially. Thank you.