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

   1 // run-rustfix
   2
   3 #![warn(clippy::or_then_unwrap)]
   4 #![allow(clippy::map_identity)]
   5
   6 struct SomeStruct {}
   7 impl SomeStruct {
   8     fn or(self, _: Option<Self>) -> Self {
   9         self
  10     }
  11     fn unwrap(&self) {}
  12 }
  13
  14 struct SomeOtherStruct {}
  15 impl SomeOtherStruct {
  16     fn or(self) -> Self {
  17         self
  18     }
  19     fn unwrap(&self) {}
  20 }
  21
  22 fn main() {
  23     let option: Option<&str> = None;
  24     let _ = option.or(Some("fallback")).unwrap(); // should trigger lint
  25
  26     let result: Result<&str, &str> = Err("Error");
  27     let _ = result.or::<&str>(Ok("fallback")).unwrap(); // should trigger lint
  28
  29     // as part of a method chain
  30     let option: Option<&str> = None;
  31     let _ = option.map(|v| v).or(Some("fallback")).unwrap().to_string().chars(); // should trigger lint
  32
  33     // Not Option/Result
  34     let instance = SomeStruct {};
  35     let _ = instance.or(Some(SomeStruct {})).unwrap(); // should not trigger lint
  36
  37     // or takes no argument
  38     let instance = SomeOtherStruct {};
  39     let _ = instance.or().unwrap(); // should not trigger lint and should not panic
  40
  41     // None in or
  42     let option: Option<&str> = None;
  43     let _ = option.or(None).unwrap(); // should not trigger lint
  44
  45     // Not Err in or
  46     let result: Result<&str, &str> = Err("Error");
  47     let _ = result.or::<&str>(Err("Other Error")).unwrap(); // should not trigger lint
  48
  49     // other function between
  50     let option: Option<&str> = None;
  51     let _ = option.or(Some("fallback")).map(|v| v).unwrap(); // should not trigger lint
  52 }