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

   1 // run-rustfix
   2 #![warn(clippy::extend_with_drain)]
   3 #![allow(clippy::iter_with_drain)]
   4 use std::collections::BinaryHeap;
   5 fn main() {
   6     //gets linted
   7     let mut vec1 = vec![0u8; 1024];
   8     let mut vec2: std::vec::Vec<u8> = Vec::new();
   9     vec2.extend(vec1.drain(..));
  10
  11     let mut vec3 = vec![0u8; 1024];
  12     let mut vec4: std::vec::Vec<u8> = Vec::new();
  13
  14     vec4.extend(vec3.drain(..));
  15
  16     let mut vec11: std::vec::Vec<u8> = Vec::new();
  17
  18     vec11.extend(return_vector().drain(..));
  19
  20     //won't get linted it doesn't move the entire content of a vec into another
  21     let mut test1 = vec![0u8, 10];
  22     let mut test2: std::vec::Vec<u8> = Vec::new();
  23
  24     test2.extend(test1.drain(4..10));
  25
  26     let mut vec3 = vec![0u8; 104];
  27     let mut vec7: std::vec::Vec<u8> = Vec::new();
  28
  29     vec3.append(&mut vec7);
  30
  31     let mut vec5 = vec![0u8; 1024];
  32     let mut vec6: std::vec::Vec<u8> = Vec::new();
  33
  34     vec5.extend(vec6.drain(..4));
  35
  36     let mut vec9: std::vec::Vec<u8> = Vec::new();
  37
  38     return_vector().append(&mut vec9);
  39
  40     //won't get linted because it is not a vec
  41
  42     let mut heap = BinaryHeap::from(vec![1, 3]);
  43     let mut heap2 = BinaryHeap::from(vec![]);
  44     heap2.extend(heap.drain());
  45
  46     let mut x = vec![0, 1, 2, 3, 5];
  47     let ref_x = &mut x;
  48     let mut y = Vec::new();
  49     y.extend(ref_x.drain(..));
  50 }
  51
  52 fn return_vector() -> Vec<u8> {
  53     let mut new_vector = vec![];
  54
  55     for i in 1..10 {
  56         new_vector.push(i)
  57     }
  58
  59     new_vector
  60 }