error[E0282]: type annotations needed for `std::vec::Vec<T>`
  --> $DIR/vector-no-ann.rs:2:16
   |
LL |     let _foo = Vec::new();
   |         ----   ^^^^^^^^ cannot infer type for `T`
   |         |
   |         consider giving `_foo` the explicit type `std::vec::Vec<T>`, where the type parameter `T` is specified

error: aborting due to previous error

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