我可以用局部变量隐藏常量绑定吗?

我想这会管用的:

const x: &str = "10";            // declare a const
let x: i32 = x.parse().unwrap(); // reuse the same name for a let binding
assert_eq!(10, x);

error[E0308]: mismatched types
 --> src/main.rs:3:9
  |
3 |     let x: i32 = x.parse().unwrap(); // reuse the same name for a let binding
  |         ^ expected i32, found reference
  |
  = note: expected type `i32`
             found type `&'static str`

error[E0277]: the trait bound `{integer}: std::cmp::PartialEq<&str>` is not satisfied
 --> src/main.rs:4:5
  |
4 |     assert_eq!(10, x);
  |     ^^^^^^^^^^^^^^^^^^ can't compare `{integer}` with `&str`
  |
  = help: the trait `std::cmp::PartialEq<&str>` is not implemented for `{integer}`
  = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

这是有效的:

const x: &str = "10";
let y: i32 = x.parse().unwrap();
assert_eq!(10, y);

这也是:

let x: &str = "10";
let x: i32 = x.parse().unwrap();
assert_eq!(10, x);

是我做错了什么,还是不可能遮蔽一个存在? const 与 let 用同一个名字?