Inconsistent analysis results for unsafe blocks and operators

[rchaser53]

related: rust-lang/rustfmt#3770
rust playground link: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=ef4769175cb5b4febb445b05c1e27b82

The second !unsafe block return &&bool. I think the second block should return bool.

fn return_bool() -> bool {
    unsafe { false }            // expected (), found bool
        && !unsafe { true }     // expected bool found &&bool
        && !unsafe { false }    // expected bool found bool
}

[Mark-Simulacrum]

Simplifies to:

fn return_bool() -> bool {
    {
        false
    }
    && { false }     
        && { false } 
}

[nagisa]

This is an expected corner-case in parsing. See #17930.

Closing.