error[E0432]: unresolved import `alloc`
  --> $DIR/issue-54006.rs:16:5
   |
LL | use alloc::vec;
   |     ^^^^^ Did you mean `core::alloc`?

error: cannot determine resolution for the macro `vec`
  --> $DIR/issue-54006.rs:20:18
   |
LL |     let mut xs = vec![];
   |                  ^^^
   |
   = note: import resolution is stuck, try simplifying macro imports

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0432`.