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: basic_block.rs
    path of file: ./repos/rustc_codegen_clr/src
    
    the code of the file until where you have to start completion: use std::collections::HashSet;

use crate::{
    cil::CILOp,
    cil_tree::{cil_root::CILRoot, CILTree},
};
use rustc_middle::mir::BasicBlockData;
use rustc_middle::mir::UnwindAction;
use rustc_middle::{
    mir::{BasicBlocks, Body, TerminatorKind},
    ty::{Instance, InstanceDef, TyCtxt},
};
#[derive(Clone, Debug)]
pub struct BasicBlock {
    trees: Vec<CILTree>,
    id: u32,
    handler: Option<Handler>,
}
#[derive(Clone, Debug)]
pub enum Handler {
    RawID(u32),
    Blocks(Vec<BasicBlock>),
}

pub fn handler_for_block<'tyctx>(
    block_data: &BasicBlockData,
    blocks: &BasicBlocks<'tyctx>,
    tyctx: TyCtxt<'tyctx>,
    method_instance: &Instance<'tyctx>,
    method: &Body<'tyctx>,
) -> Option<Handler> {
    let term 
    
    pub fn resolve_exception_handlers(&mut self, handler_bbs: &[BasicBlock]) {
        let handler = if let Some(handler) = &self.handler {
            handler
        } else {
            return;
        };
        let handler_id = if let Handler::RawID(handler_id) = handler {
            handler_id
        } else {
            panic!("Tired to double-resolve ");
        };
        // Get alive blovks
        let mut handler = block_gc(*handler_id, handler_bbs);
        // Fix up handler jumps
        handler.iter_mut().for_each(|bb: &mut BasicBlock| {
            bb.trees
                .iter_mut()
                .for_each(|tree| tree.fix_for_exception_handler(self.id()));
        });
        // Insert the "jumpstarter"
        handler.insert(
            0,
            BasicBlock::new(
                vec![CILRoot::GoTo {
                    target: self.id(),
                    sub_target: *handler_id,
                }
                .into()],
                u32::MAX,
                None,
            ),
        );
        // Generate launching pads for cross-block branches!
        let id = self.id();
        for (target, sub_target) in self.targets() {
            assert_eq!(sub_target, 0);
            self.trees.push(
                CILRoot::Raw {
                    ops: Box::new([CILOp::Label(id, target), CILOp::Leave(target)]),
                }
                .into(),
            )
        }
        // Change branches to use lanuching pads.

        self.trees
            .iter_mut()
            .for_each(|tree| tree.fix_for_exception_handler(id));
        self.handler = Some(Handler::Blocks(handler));
    }