error[E0282]: type annotations needed for `std::vec::Vec<T>`
  --> $DIR/cannot_infer_local_or_vec.rs:2:13
   |
LL |     let x = vec![];
   |         -   ^^^^^^ cannot infer type for `T`
   |         |
   |         consider giving `x` the explicit type `std::vec::Vec<T>`, where the type parameter `T` is specified
   |
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error: aborting due to previous error

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