tests/ui/drop_forget_ref.rs

   1 #![warn(clippy::drop_ref, clippy::forget_ref)]
   2 #![allow(clippy::toplevel_ref_arg, clippy::similar_names, clippy::needless_pass_by_value)]
   3
   4 use std::mem::{drop, forget};
   5
   6 struct SomeStruct;
   7
   8 fn main() {
   9     drop(&SomeStruct);
  10     forget(&SomeStruct);
  11
  12     let mut owned1 = SomeStruct;
  13     drop(&owned1);
  14     drop(&&owned1);
  15     drop(&mut owned1);
  16     drop(owned1); //OK
  17     let mut owned2 = SomeStruct;
  18     forget(&owned2);
  19     forget(&&owned2);
  20     forget(&mut owned2);
  21     forget(owned2); //OK
  22
  23     let reference1 = &SomeStruct;
  24     drop(reference1);
  25     forget(&*reference1);
  26
  27     let reference2 = &mut SomeStruct;
  28     drop(reference2);
  29     let reference3 = &mut SomeStruct;
  30     forget(reference3);
  31
  32     let ref reference4 = SomeStruct;
  33     drop(reference4);
  34     forget(reference4);
  35 }
  36
  37 #[allow(dead_code)]
  38 fn test_generic_fn_drop<T>(val: T) {
  39     drop(&val);
  40     drop(val); //OK
  41 }
  42
  43 #[allow(dead_code)]
  44 fn test_generic_fn_forget<T>(val: T) {
  45     forget(&val);
  46     forget(val); //OK
  47 }
  48
  49 #[allow(dead_code)]
  50 fn test_similarly_named_function() {
  51     fn drop<T>(_val: T) {}
  52     drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
  53     std::mem::drop(&SomeStruct);
  54     fn forget<T>(_val: T) {}
  55     forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
  56     std::mem::forget(&SomeStruct);
  57 }