Formatter loses comment in the middle of an expression

[dplassgit]

To Reproduce
Enter this into the editor of your choice

fn broken() ->u32 {
    const x = u32:1  + // keep me
        u32:2;
    x
}

Then format it.

Expected behavior

The output is the input.

Actual behavior
The comment is deleted:

fn broken() -> u32 {
    const x = u32:1 + u32:2;
    x
}

[dplassgit]

Similar for unary operator, cast, etc.