Confusing parse error with let bindings

[Zoxc]

This code:

fn main() {
    let a = 3
}

gives the error:

error: expected one of `.`, `;`, `?`, or an operator, found `}`
 --> src/main.rs:3:1
  |
2 |     let a = 3
  |              - expected one of `.`, `;`, `?`, or an operator here
3 | }
  | ^ unexpected token

It would be nice if this would instead say that let is not an expression.