error[E0282]: type annotations needed
  --> $DIR/not-wf-ambiguous-normalization.rs:14:23
   |
LL | impl<T> Allocator for DefaultAllocator {
   |                       ^^^^^^^^^^^^^^^^ cannot infer type for type parameter `T`

error: aborting due to 1 previous error

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