error: setters must start with `set_`, found: a
  --> $DIR/invalid-setter.rs:10:8
   |
10 |     fn a(this: &A, b: i32);
   |        ^

error: setters must start with `set_`, found: x
  --> $DIR/invalid-setter.rs:15:46
   |
15 |     #[wasm_bindgen(setter, method, js_name = x)]
   |                                              ^

error: aborting due to 2 previous errors