3 #![allow(unused_imports, clippy::redundant_clone)]
4 #![warn(clippy::option_as_ref_deref)]
6 use std::ffi::{CString, OsString};
7 use std::ops::{Deref, DerefMut};
8 use std::path::PathBuf;
11 let mut opt = Some(String::from("123"));
13 let _ = opt.clone().as_ref().map(Deref::deref).map(str::len);
22 let _ = opt.as_mut().map(DerefMut::deref_mut);
24 let _ = opt.as_ref().map(String::as_str);
25 let _ = opt.as_ref().map(|x| x.as_str());
26 let _ = opt.as_mut().map(String::as_mut_str);
27 let _ = opt.as_mut().map(|x| x.as_mut_str());
28 let _ = Some(CString::new(vec![]).unwrap()).as_ref().map(CString::as_c_str);
29 let _ = Some(OsString::new()).as_ref().map(OsString::as_os_str);
30 let _ = Some(PathBuf::new()).as_ref().map(PathBuf::as_path);
31 let _ = Some(Vec::<()>::new()).as_ref().map(Vec::as_slice);
32 let _ = Some(Vec::<()>::new()).as_mut().map(Vec::as_mut_slice);
34 let _ = opt.as_ref().map(|x| x.deref());
35 let _ = opt.clone().as_mut().map(|x| x.deref_mut()).map(|x| x.len());
37 let vc = vec![String::new()];
38 let _ = Some(1_usize).as_ref().map(|x| vc[*x].as_str()); // should not be linted
40 let _: Option<&str> = Some(&String::new()).as_ref().map(|x| x.as_str()); // should not be linted
42 let _ = opt.as_ref().map(|x| &**x);
43 let _ = opt.as_mut().map(|x| &mut **x);
46 let _ = opt.as_ref().map(std::ops::Deref::deref);