error[E0573]: expected type, found local variable `num`
  --> $DIR/let-binding-init-expr-as-ty.rs:2:27
   |
LL |     let foo: i32::from_be(num);
   |            --             ^^^ not a type
   |            |
   |            help: use `=` if you meant to assign

error: argument types not allowed with return type notation
  --> $DIR/let-binding-init-expr-as-ty.rs:2:26
   |
LL |     let foo: i32::from_be(num);
   |                          ^^^^^ help: remove the input types: `()`
   |
   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
   = help: add `#![feature(return_type_notation)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: return type notation not allowed in this position yet
  --> $DIR/let-binding-init-expr-as-ty.rs:2:14
   |
LL |     let foo: i32::from_be(num);
   |              ^^^^^^^^^^^^^^^^^

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0573`.