Experiments handling errors in wasm-bindgen.

web_error.rs

#![feature(use_extern_macros, wasm_custom_section, wasm_import_module, proc_macro_mod)]

extern crate wasm_bindgen;
extern crate web_sys;

use wasm_bindgen::prelude::*;
use web_sys::{console, Node};

macro_rules! try_web {
    ($e:expr) => {
        match $e {
            Ok(inner) => inner,
            Err(e) => {
                console::error(e.clone());
                panic!(e);
            }
        }
    };
}

#[wasm_bindgen]
extern {
    static window: web_sys::Window;
}

#[wasm_bindgen]
pub fn run() {
    std::panic::set_hook(Box::new(|info| { console::error(info.to_string().into()); }));
    let doc = window.document().unwrap();
    let el = try_web!(doc.create_element_using_local_name("p"));
    let text = doc.create_text_node("content");
    try_web!(<AsRef<Node>>::as_ref(&el).append_child(<AsRef<Node>>::as_ref(&text)));
    try_web!(<AsRef<Node>>::as_ref(&doc).append_child(<AsRef<Node>>::as_ref(&el)));
}