Suggestion to remove ?

[varkor]

struct A;
struct B;

fn foo() -> Result<A, B> {
    Ok(A)
}

fn bar() -> Result<A, B> {
    foo()?
}

produces:

error[E0308]: try expression alternatives have incompatible types
 --> src/lib.rs:9:5
  |
9 |     foo()?
  |     ^^^^^^ expected enum `std::result::Result`, found struct `A`
  |
  = note: expected type `std::result::Result<A, B>`
             found type `A`

It would be helpful if Rust suggested removing the ? here, as without it, the function has the correct return type.