error[E0282]: type annotations needed
  --> $DIR/multidispatch-convert-ambig-dest.rs:26:5
   |
LL |     test(22, std::default::Default::default());
   |     ^^^^ cannot infer type for type parameter `U` declared on the function `test`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0282`.