Calling Javascript From My 16bit VM | Live Rust Programming

It turns out that calling Javascript is complicated! I need to rework my system call interface, then find quite a few fun borrow checker quirks to make this hard. It turns out this is way more of a rabbit hole than I expected!
Stream date: 2024-06-25
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[@valshaped]

22:48: The borrow checker is smart enough to know you can split a struct into multiple borrows. ``` struct Ctx { vm: VM, handlers: HashMap } let mut ctx = Ctx { vm: VM::new(), handlers: HashMap::new() }; let vm = &mut ctx.vm; let handlers = &mut ctx.handlers; handlers.get_mut(1).and_then(|h| h.handle(vm)); // This is OK, because man.vm can never overlap with man.handlers ``` There's also pattern-destructuring syntax if you want to be even more explicit: ```rust struct Manager { vm: VM, handlers: HashMap } fn do_the_thing(manager: &mut Manager) -> Result { let Manager { vm, handlers } = manager; // vm: &mut VM, handlers: &mut HashMap let handler = handlers.get_mut(2).unwrap(); // handler: &mut Handler let arg = vm.registers[0]; handler.handle(vm, arg) } ```

[@TomMarksTalksCodeLIVE]

I keep being surprised by how clever the borrow checker is!