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: split_import.rs
    path of file: ./repos/rust-analyzer/crates/ide-assists/src/handlers
    
    the code of the file until where you have to start completion: use syntax::{ast, AstNode, T};

use crate::{AssistContext, AssistId, AssistKind, Assists};

// Assist: split_import
//
// Wraps the tail of import into braces.
//
// ```
// use std::$0collections::HashMap;
// ```
// ->
// ```
// use std::{collections::HashMap};
// ```
pub(crate) fn split_import(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let colon_colon = ctx.find_token_syntax_at_offset(T![::])?;
    let path = ast::Path::cast(colon_colon.parent()?)?.qualifier()?;

    let use_tree = path.top_path().syntax().ancestors().find_map(ast::UseTree::cast)?;

    let has_er
    
pub(crate) fn split_import(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
    let colon_colon = ctx.find_token_syntax_at_offset(T![::])?;
    let path = ast::Path::cast(colon_colon.parent()?)?.qualifier()?;

    let use_tree = path.top_path().syntax().ancestors().find_map(ast::UseTree::cast)?;

    let has_errors = use_tree
        .syntax()
        .descendants_with_tokens()
        .any(|it| it.kind() == syntax::SyntaxKind::ERROR);
    let last_segment = use_tree.path().and_then(|it| it.segment());
    if has_errors || last_segment.is_none() {
        return None;
    }

    let target = colon_colon.text_range();
    acc.add(AssistId("split_import", AssistKind::RefactorRewrite), "Split import", target, |edit| {
        let use_tree = edit.make_mut(use_tree.clone());
        let path = edit.make_mut(path);
        use_tree.split_prefix(&path);
    })
}