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

   1 #![warn(clippy::from_over_into)]
   2
   3 struct InMacro(String);
   4
   5 macro_rules! in_macro {
   6     () => {
   7         Self::new()
   8     };
   9 }
  10
  11 impl Into<InMacro> for String {
  12     //~^ ERROR: an implementation of `From` is preferred since it gives you `Into<_>` for free
  13     fn into(self) -> InMacro {
  14         InMacro(in_macro!())
  15     }
  16 }
  17
  18 struct WeirdUpperSelf;
  19
  20 impl Into<WeirdUpperSelf> for &'static [u8] {
  21     //~^ ERROR: an implementation of `From` is preferred since it gives you `Into<_>` for free
  22     fn into(self) -> WeirdUpperSelf {
  23         let _ = Self::default();
  24         WeirdUpperSelf
  25     }
  26 }
  27
  28 struct ContainsVal;
  29
  30 impl Into<u8> for ContainsVal {
  31     //~^ ERROR: an implementation of `From` is preferred since it gives you `Into<_>` for free
  32     fn into(self) -> u8 {
  33         let val = 1;
  34         val + 1
  35     }
  36 }
  37
  38 pub struct Lval<T>(T);
  39
  40 pub struct Rval<T>(T);
  41
  42 impl<T> Into<Rval<Self>> for Lval<T> {
  43     //~^ ERROR: an implementation of `From` is preferred since it gives you `Into<_>` for free
  44     fn into(self) -> Rval<Self> {
  45         Rval(self)
  46     }
  47 }
  48
  49 fn main() {}