You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: zero.rs
    path of file: ./repos/rustfmt/tests/source/configs/single_line_let_else_max_width
    
    the code of the file until where you have to start completion: // rustfmt-single_line_let_else_max_width: 0

fn main() {
    let Some(a) = opt else {};

    let Some(b) = opt else { return };

    let Some(c) = opt else {
        return
    };

    let Some(c) = opt else {
        // a comment sh
    
fn main() {
    let Some(a) = opt else {};

    let Some(b) = opt else { return };

    let Some(c) = opt else {
        return
    };

    let Some(c) = opt else {
        // a comment should always force the block to be multi-lined
        return
    };

    let Some(c) = opt else { /* a comment should always force the block to be multi-lined */ return };

    let Some(d) = some_very_very_very_very_long_name else { return };

    let Expr::Slice(ast::ExprSlice { lower, upper, step, range: _ }) = slice.as_ref() else {
        return
    };

    let Some((base_place, current)) = self.lower_expr_as_place(current, *base, true)? else {
        return Ok(None)
    };

    let Some(doc_attr) = variant.attrs.iter().find(|attr| attr.path().is_ident("doc")) else {
        return Err(Error::new(variant.span(), r#"expected a doc comment"#))
    };

    let Some((base_place, current)) = self.lower_expr_as_place(current, *base, true) else {
        return Ok(None)
    };

    let Stmt::Expr(Expr::Call(ExprCall { args: some_args, .. }), _) = last_stmt else {
        return Err(Error::new(last_stmt.span(), "expected last expression to be `Some(match (..) { .. })`"))
    };
}