Extract into function assist allows extracting unmatched braces

[Veykril]

You can basically just extract braces it seems?

To clarify this:

impl ... {
    pub fn as_str(&self) -> &str {
        &self.0$0
    }$0
}

becomes

impl ... {
    pub fn as_str(&self) -> &str {
        &self.0fun_name();
}

fn fun_name() {
}

The assist really shouldn't be applicable with that selection.