message: Make happy path
diff: @@ -59,7 +59,7 @@ macro_rules! mock_external {
  ($import:ident, $name:ident) => {{
  extern fn _mocked_fn() -> i32 {
  debug!("emscripten::{} <mock>", stringify!($name));
  - -1
  + 0
  }
  $import.set(
  "env",
  