{"id":2878,"date":"2026-02-22T15:21:46","date_gmt":"2026-02-22T14:21:46","guid":{"rendered":"https:\/\/janus.rs\/?p=2878"},"modified":"2026-02-22T15:21:51","modified_gmt":"2026-02-22T14:21:51","slug":"rust-nation-uk-2026-webassembly-mutation-testing","status":"publish","type":"post","link":"https:\/\/janus.rs\/en\/2026\/02\/rust-nation-uk-2026-webassembly-mutation-testing\/","title":{"rendered":"Rust Nation UK 2026 &#8211; WebAssembly &amp; Mutation Testing"},"content":{"rendered":"<p class=\"has-medium-font-size wp-block-paragraph\">As in previous years, I offer a summary of my experiences at Rust Nation UK. This overview is primarily intended for decision-makers with a strong technical background who value concise updates on recent developments. The key topics include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">WebAssembly - Embedding in the browser, the cloud, or on edge devices<\/li>\n\n\n\n<li class=\"has-medium-font-size\">The surprise Aha-Effect - Blazingly fast mutation testing<\/li>\n\n\n\n<li class=\"has-medium-font-size\">The Rust London Meetup - Meeting key community members<\/li>\n\n\n\n<li class=\"has-medium-font-size\">An AI Brunch - Deserving a separate post<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">Workshop Day - WebAssembly<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">I booked the workshop: \u201cContainers are dead! Long live WebAssembly!\u201d by my former teammate Jonas Kruckenberg. With Jonas, I was working at Mainmatter to port the Redis Search Extension to Rust. Jonas is also well known in the Rust Dortmund Community as he presented his WebAssembly based operating system k23 at our very first event. <a href=\"https:\/\/youtu.be\/v4HofvYXTo0\">You find the talk on YouTube.<\/a>. <\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Why should you bother about WebAssembly? Because it has many use cases besides writing functionality in different languages than JavaScript for a browser.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS.jpg?resize=1024%2C768&#038;ssl=1\" alt=\"\" class=\"wp-image-2879\" srcset=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=1536%2C1152&amp;ssl=1 1536w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=2048%2C1536&amp;ssl=1 2048w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?resize=16%2C12&amp;ssl=1 16w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-scaled.jpg?w=2400&amp;ssl=1 2400w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">It can be embedded in the cloud (serverless), and there it reduces cold start time. On edge-devices, for example, in automotive, it enhances security by sandboxing and empowers developers to write modules in different languages. <\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Christof Petig, who is very active in safety-critical field in automotive, gave a <a href=\"https:\/\/youtu.be\/qsfBN3MpIQw\">talk <\/a>about WebAssembly\u2019s usage in cars for our Rust Dortmund Community. <\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">But let me summarize: WebAssembly serves as a modern, language-agnostic, secure, and high-performance alternative to earlier component models like COM or CORBA, enabling broader interoperability by using a bytecode intermediate language that most WebAssembly runtimes can just-in-time compile to native binaries.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">Conference Day - The surprise Aha-Effect<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The conference was hilarious. I had many nice chats and met old friends. Nonetheless let me focus on my surprise aha-effect related to mutation testing.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The main idea of mutation testing is to mutate your program. For example, you replace your Plus operator with a Minus operator, or you mix up conditions in an if,else-if,else block. Then you expect your test suite to fail. if it does not fail, you probably should add a test that covers that case.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The challenge here is that mutating a native program means you have to recompile it and that's turtle slow. However, PhD student Zal\u00e1n L\u00e9vai works on <a href=\"https:\/\/mutest.rs\/\">mutest-rs<\/a>. A Rust crate that uses the compiler rustc as a library and changes the AST in memory, thus reducing the number of required compilations a lot and making it blazingly fast (in comparison). If you want more details, they published a journal paper<a href=\"https:\/\/dl.acm.org\/doi\/10.1145\/3787851\">A Comprehensive Empirical and Theoretical Analysis of Batching Algorithms for Efficient, Safe, Parallel Mutation Analysis in Rust<\/a>earlier this year. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"799\" height=\"245\" src=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/MutationTesting.png?resize=799%2C245&#038;ssl=1\" alt=\"\" class=\"wp-image-2881\" srcset=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/MutationTesting.png?w=799&amp;ssl=1 799w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/MutationTesting.png?resize=300%2C92&amp;ssl=1 300w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/MutationTesting.png?resize=768%2C235&amp;ssl=1 768w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/MutationTesting.png?resize=18%2C6&amp;ssl=1 18w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A particularly striking result: workloads that require approximately 20 hours with cargo-mutants complete in roughly 5 minutes using mutest-rs, thanks to in-memory AST transformations and compiler-as-library integration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">Pre-Conference Day - Rust London Meetup<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Before all of that, we gathered at the offices of TrueLayer for the Rust London Meetup. I was happy to reconnect with Rob Ede, well known for the Rust backend crate Actix Web and with Orhun, maintainer of the popular Ratatui TUI library. <\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Orhun, a content creator from Turkey, shares a mindset around <a href=\"https:\/\/janus.rs\/en\/janus-it-and-friends\/\">discipline and sport<\/a>; many in the community regard him as an exceptional tinkerer. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS.jpg?resize=1024%2C768&#038;ssl=1\" alt=\"\" class=\"wp-image-2880\" srcset=\"https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=1024%2C768&amp;ssl=1 1024w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=768%2C576&amp;ssl=1 768w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=1536%2C1152&amp;ssl=1 1536w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=2048%2C1536&amp;ssl=1 2048w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?resize=16%2C12&amp;ssl=1 16w, https:\/\/i0.wp.com\/janus.rs\/wp-content\/uploads\/2026\/02\/20260219_141402346_iOS-scaled.jpg?w=2400&amp;ssl=1 2400w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">As always, Ernest and Ethan did an amazing job with the organization and for those of you who didn't know: The Rust London Community and their organizers in particular fueled me with the idea to start the Rust Dortmund Meetup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">After Conference Brunch - Rust in a World of AI<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">On the post conference day we met to speak about Rust in a world of AI. However, I think this topic deserves an entire blog post on its own. This has two reasons:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">The week after Rust Nation, I will attend the \u201cInstandhaltungstage\u201d and the Impulse Event for young professionals in the chemical industry. There, I plan to go to many AI related talks to grasp an understanding of what AI means in that field at the moment.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">While AI will not replace software engineers entirely, agentic systems are advancing rapidly, and many developers may currently underestimate their capabilities. Importantly, insights from agentic programming are likely to inform superior tooling across other industries.<\/li>\n<\/ol>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Overall, Rust Nation UK 2026 underscored the rapid maturation of Rust in areas like WebAssembly, testing tooling, and emerging AI integration\u2014trends worth monitoring closely for technical leadership roles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p>Wie in den Vorjahren pr\u00e4sentiere ich eine Zusammenfassung meiner Erfahrungen bei der Rust Nation UK. Dieser \u00dcberblick richtet sich in erster Linie an Entscheidungstr\u00e4ger mit fundiertem technischem Hintergrund, die knappe Aktualisierungen zu aktuellen Entwicklungen sch\u00e4tzen. Die wichtigsten Themen umfassen: Workshop Tag \u2013 WebAssembly Ich habe den Workshop \u201eContainers are dead! Long live WebAssembly!\u201c bei meinem [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","_jetpack_memberships_contains_paid_content":false,"ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2878","post","type-post","status-publish","format-standard","hentry","category-nicht-kategorisiert","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rust Nation UK 2026 - WebAssembly &amp; Mutation Testing - Janus IT<\/title>\n<meta name=\"description\" content=\"WebAssembly &amp; Mutation Testing, mutest-rs beschleunigt Mutationstests (20 h -&gt; 5 m) und mehr Rust Trends f\u00fcr technische Entscheider.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/janus.rs\/en\/2026\/02\/rust-nation-uk-2026-webassembly-mutation-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rust Nation UK 2026 - WebAssembly &amp; Mutation Testing - Janus IT\" \/>\n<meta property=\"og:description\" content=\"WebAssembly &amp; Mutation Testing, mutest-rs beschleunigt Mutationstests (20 h -&gt; 5 m) und mehr Rust Trends f\u00fcr technische Entscheider.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/janus.rs\/en\/2026\/02\/rust-nation-uk-2026-webassembly-mutation-testing\/\" \/>\n<meta property=\"og:site_name\" content=\"Janus IT\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-22T14:21:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-22T14:21:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/janus.rs\/wp-content\/uploads\/2026\/02\/20260218_101426676_iOS-1024x768.jpg\" \/>\n<meta name=\"author\" content=\"Tim Janus\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@DarthB86\" \/>\n<meta name=\"twitter:site\" content=\"@DarthB86\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tim Janus\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/janus.rs\/2026\/02\/rust-nation-uk-2026-webassembly-mutation-testing\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/janus.rs\/2026\/02\/rust-nation-uk-2026-webassembly-mutation-testing\/\"},\"author\":{\"name\":\"Tim Janus\",\"@id\":\"https:\/\/janus.rs\/en\/#\/schema\/person\/a4844f3174ecb193eccd444867233aef\"},\"headline\":\"Rust Nation UK 2026 &#8211; 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