Suggested fix does not account for operator precedence

[DomantasJ]

This fails (as expected):

fn foo() -> String {
    1 + 2
}

However, the help message is wrong:

error[E0308]: mismatched types
 --> src/lib.rs:2:5
  |
1 | fn foo() -> String {
  |             ------ expected `std::string::String` because of return type
2 |     1 + 2
  |     ^^^^^
  |     |
  |     expected struct `std::string::String`, found integer
  |     help: try using a conversion method: `1 + 2.to_string()`
  |
  = note: expected type `std::string::String`
             found type `{integer}`

It should suggest (1 + 2).to_string() instead.

Rust version: 1.38.0 (stable)

[sam09]

I would like to pick this up, in case nobody is working on it

[varkor]

@sam09: go ahead!