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

   1 #![warn(clippy::no_effect_replace)]
   2
   3 fn main() {
   4     let _ = "12345".replace('1', "1");
   5     let _ = "12345".replace("12", "12");
   6     let _ = String::new().replace("12", "12");
   7
   8     let _ = "12345".replacen('1', "1", 1);
   9     let _ = "12345".replacen("12", "12", 1);
  10     let _ = String::new().replacen("12", "12", 1);
  11
  12     let _ = "12345".replace("12", "22");
  13     let _ = "12345".replacen("12", "22", 1);
  14
  15     let mut x = X::default();
  16     let _ = "hello".replace(&x.f(), &x.f());
  17     let _ = "hello".replace(&x.f(), &x.ff());
  18
  19     let _ = "hello".replace(&y(), &y());
  20     let _ = "hello".replace(&y(), &z());
  21
  22     let _ = Replaceme.replace("a", "a");
  23 }
  24
  25 #[derive(Default)]
  26 struct X {}
  27
  28 impl X {
  29     fn f(&mut self) -> String {
  30         "he".to_string()
  31     }
  32
  33     fn ff(&mut self) -> String {
  34         "hh".to_string()
  35     }
  36 }
  37
  38 fn y() -> String {
  39     "he".to_string()
  40 }
  41
  42 fn z() -> String {
  43     "hh".to_string()
  44 }
  45
  46 struct Replaceme;
  47 impl Replaceme {
  48     pub fn replace(&mut self, a: &str, b: &str) -> Self {
  49         Self
  50     }
  51 }