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Inside Rust’s no main World: How Binaries Run Without std: Revision history

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19 November 2025

  • curprev 07:4407:44, 19 November 2025 PC talk contribs 9,573 bytes +9,573 Created page with "500px Most Rust developers think every Rust program starts with this: fn main() { println!("Hello, world!"); } But deep down in the guts of embedded systems, kernels, and bootloaders, there’s no println!, no heap, and not even a main function. That’s the #![no_main] world — where Rust becomes bare-metal, and you’re on your own. This isn’t a theoretical curiosity. This is the world of firmware, operating systems, and WASM run..."
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