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241 B
Rust
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#![feature(proc_macro)]
extern crate wasm_bindgen;
use wasm_bindgen::prelude::*;
#[wasm_bindgen]
extern {
fn alert(s: &str);
}
#[wasm_bindgen]
#[no_mangle]
pub extern fn greet(name: &str) {
alert(&format!("Hello, {}!", name));
}