src/tools/clippy/tests/ui/vec.fixed

   1 // run-rustfix
   2 #![allow(clippy::nonstandard_macro_braces)]
   3 #![warn(clippy::useless_vec)]
   4
   5 #[derive(Debug)]
   6 struct NonCopy;
   7
   8 fn on_slice(_: &[u8]) {}
   9
  10 fn on_mut_slice(_: &mut [u8]) {}
  11
  12 #[allow(clippy::ptr_arg)]
  13 fn on_vec(_: &Vec<u8>) {}
  14
  15 fn on_mut_vec(_: &mut Vec<u8>) {}
  16
  17 struct Line {
  18     length: usize,
  19 }
  20
  21 impl Line {
  22     fn length(&self) -> usize {
  23         self.length
  24     }
  25 }
  26
  27 fn main() {
  28     on_slice(&[]);
  29     on_slice(&[]);
  30     on_mut_slice(&mut []);
  31
  32     on_slice(&[1, 2]);
  33     on_slice(&[1, 2]);
  34     on_mut_slice(&mut [1, 2]);
  35
  36     on_slice(&[1, 2]);
  37     on_slice(&[1, 2]);
  38     on_mut_slice(&mut [1, 2]);
  39     #[rustfmt::skip]
  40     on_slice(&[1, 2]);
  41     on_slice(&[1, 2]);
  42     on_mut_slice(&mut [1, 2]);
  43
  44     on_slice(&[1; 2]);
  45     on_slice(&[1; 2]);
  46     on_mut_slice(&mut [1; 2]);
  47
  48     on_vec(&vec![]);
  49     on_vec(&vec![1, 2]);
  50     on_vec(&vec![1; 2]);
  51     on_mut_vec(&mut vec![]);
  52     on_mut_vec(&mut vec![1, 2]);
  53     on_mut_vec(&mut vec![1; 2]);
  54
  55     // Now with non-constant expressions
  56     let line = Line { length: 2 };
  57
  58     on_slice(&vec![2; line.length]);
  59     on_slice(&vec![2; line.length()]);
  60     on_mut_slice(&mut vec![2; line.length]);
  61     on_mut_slice(&mut vec![2; line.length()]);
  62
  63     for a in &[1, 2, 3] {
  64         println!("{:?}", a);
  65     }
  66
  67     for a in vec![NonCopy, NonCopy] {
  68         println!("{:?}", a);
  69     }
  70
  71     on_vec(&vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
  72     on_mut_vec(&mut vec![1; 201]); // Ok, size of `vec` higher than `too_large_for_stack`
  73
  74     // Ok
  75     for a in vec![1; 201] {
  76         println!("{:?}", a);
  77     }
  78 }