Lint: spurrious unused_parens on assignment of comparison

[thepowersgang]

The following code triggers the unused_parens lint, but without the parens the equality operator can be (visually) confused with the assignment.

fn main()
{
    let bar = "";
    let _foo = (bar == "baz");
}

[Centril]

I'm skeptical that the behavior of the lint is incorrect; it does not seem to me like let x = a == b; is so confusing or that it would arise often enough.