error[E0599]: no function or associated item named `contains` found for struct `Vec<_, _>` in the current scope
  --> $DIR/deref-path-method.rs:3:10
   |
LL |     Vec::contains(&vec, &0);
   |          ^^^^^^^^ function or associated item not found in `Vec<_, _>`
   |
note: if you're trying to build a new `Vec<_, _>` consider using one of the following associated functions:
      Vec::<T>::new
      Vec::<T>::with_capacity
      Vec::<T>::from_raw_parts
      Vec::<T, A>::new_in
      and 2 others
  --> $SRC_DIR/alloc/src/vec/mod.rs:LL:COL
help: the function `contains` is implemented on `[_]`
   |
LL |     <[_]>::contains(&vec, &0);
   |     ~~~~~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.