src/tools/clippy/tests/ui/drop_forget_ref.rs

   1
   2
   3
   4 #![warn(drop_ref, forget_ref)]
   5 #![allow(toplevel_ref_arg, similar_names, needless_pass_by_value)]
   6
   7 use std::mem::{drop, forget};
   8
   9 struct SomeStruct;
  10
  11 fn main() {
  12     drop(&SomeStruct);
  13     forget(&SomeStruct);
  14
  15     let mut owned1 = SomeStruct;
  16     drop(&owned1);
  17     drop(&&owned1);
  18     drop(&mut owned1);
  19     drop(owned1); //OK
  20     let mut owned2 = SomeStruct;
  21     forget(&owned2);
  22     forget(&&owned2);
  23     forget(&mut owned2);
  24     forget(owned2); //OK
  25
  26     let reference1 = &SomeStruct;
  27     drop(reference1);
  28     forget(&*reference1);
  29
  30     let reference2 = &mut SomeStruct;
  31     drop(reference2);
  32     let reference3 = &mut SomeStruct;
  33     forget(reference3);
  34
  35     let ref reference4 = SomeStruct;
  36     drop(reference4);
  37     forget(reference4);
  38 }
  39
  40 #[allow(dead_code)]
  41 fn test_generic_fn_drop<T>(val: T) {
  42     drop(&val);
  43     drop(val); //OK
  44 }
  45
  46 #[allow(dead_code)]
  47 fn test_generic_fn_forget<T>(val: T) {
  48     forget(&val);
  49     forget(val); //OK
  50 }
  51
  52 #[allow(dead_code)]
  53 fn test_similarly_named_function() {
  54     fn drop<T>(_val: T) {}
  55     drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
  56     std::mem::drop(&SomeStruct);
  57     fn forget<T>(_val: T) {}
  58     forget(&SomeStruct); //OK; call to unrelated function which happens to have the same name
  59     std::mem::forget(&SomeStruct);
  60 }