error[E0604]: only `u8` can be cast as `char`, not `u32`
  --> $DIR/E0604.rs:2:5
   |
LL |     1u32 as char;
   |     ^^^^^^^^^^^^
   |     |
   |     invalid cast
   |     help: try `char::from_u32` instead: `char::from_u32(1u32)`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0604`.