rust/tests/ui/issues/auxiliary/issue-2631-a.rs

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#![crate_name="req"]
#![crate_type = "lib"]
use std::cell::RefCell;
use std::collections::HashMap;
use std::rc::Rc;
pub type header_map = HashMap<String, Rc<RefCell<Vec<Rc<String>>>>>;
// the unused ty param is necessary so this gets monomorphized
pub fn request<T>(req: &header_map) {
let data = req[&"METHOD".to_string()].clone();
let _x = data.borrow().clone()[0].clone();
}