error: cannot derive `FromJsValue` for enums
 --> tests/ui/failing.rs:4:1
  |
4 | enum Data {}
  | ^^^^

error: cannot derive `FromJsValue` for unions
 --> tests/ui/failing.rs:7:1
  |
7 | union Union {
  | ^^^^^

error: cannot derive `FromJsValue` for unit structs
  --> tests/ui/failing.rs:12:1
   |
12 | struct UnitStruct;
   | ^^^^^^^^^^^^^^^^^^

error: cannot derive `FromJsValue` for tuple structs
  --> tests/ui/failing.rs:15:19
   |
15 | struct TupleStruct(u32, i64);
   |                   ^^^^^^^^^^

error: unions cannot have zero fields
 --> tests/ui/failing.rs:7:1
  |
7 | / union Union {
8 | |
9 | | }
  | |_^