src/test/ui/methods/method-not-found-generic-arg-elision.rs

   1 // Test for issue 81576
   2 // Remove generic arguments if no method is found for all possible generic argument
   3
   4 use std::marker::PhantomData;
   5
   6 struct Wrapper2<'a, T, const C: usize> {
   7     x: &'a T,
   8 }
   9
  10 impl<'a, const C: usize> Wrapper2<'a, i8, C> {
  11     fn method(&self) {}
  12 }
  13
  14 impl<'a, const C: usize> Wrapper2<'a, i16, C> {
  15     fn method(&self) {}
  16 }
  17
  18 impl<'a, const C: usize> Wrapper2<'a, i32, C> {
  19     fn method(&self) {}
  20 }
  21 struct Wrapper<T>(T);
  22
  23 impl Wrapper<i8> {
  24     fn method(&self) {}
  25 }
  26
  27 impl Wrapper<i16> {
  28     fn method(&self) {}
  29 }
  30
  31 impl Wrapper<i32> {
  32     fn method(&self) {}
  33 }
  34
  35 impl Wrapper<i64> {
  36     fn method(&self) {}
  37 }
  38
  39 impl Wrapper<u8> {
  40     fn method(&self) {}
  41 }
  42
  43 impl Wrapper<u16> {
  44     fn method(&self) {}
  45 }
  46
  47 struct Point<T> {
  48     x: T,
  49     y: T,
  50 }
  51
  52 impl Point<f64> {
  53     fn distance(&self) -> f64 {
  54         self.x.hypot(self.y)
  55     }
  56 }
  57
  58 struct Other;
  59
  60 impl Other {
  61     fn other(&self) {}
  62 }
  63
  64 struct Struct<T>{
  65     _phatom: PhantomData<T>
  66 }
  67
  68 impl<T> Default for Struct<T> {
  69     fn default() -> Self {
  70         Self{ _phatom: PhantomData }
  71     }
  72 }
  73
  74 impl<T: Clone + Copy + PartialEq + Eq + PartialOrd + Ord> Struct<T> {
  75     fn method(&self) {}
  76 }
  77
  78 fn main() {
  79     let point_f64 = Point{ x: 1_f64, y: 1_f64};
  80     let d = point_f64.distance();
  81     let point_i32 = Point{ x: 1_i32, y: 1_i32};
  82     let d = point_i32.distance();
  83     //~^ ERROR no method named `distance` found for struct `Point<i32>
  84     let d = point_i32.other();
  85     //~^ ERROR no method named `other` found for struct `Point
  86     let v = vec![1_i32, 2, 3];
  87     v.iter().map(|x| x * x).extend(std::iter::once(100));
  88     //~^ ERROR no method named `extend` found for struct `Map
  89     let wrapper = Wrapper(true);
  90     wrapper.method();
  91     //~^ ERROR no method named `method` found for struct `Wrapper<bool>
  92     wrapper.other();
  93     //~^ ERROR no method named `other` found for struct `Wrapper
  94     let boolean = true;
  95     let wrapper = Wrapper2::<'_, _, 3> {x: &boolean};
  96     wrapper.method();
  97     //~^ ERROR no method named `method` found for struct `Wrapper2<'_, bool, 3_usize>
  98     wrapper.other();
  99     //~^ ERROR no method named `other` found for struct `Wrapper2
 100     let a = vec![1, 2, 3];
 101     a.not_found();
 102     //~^ ERROR no method named `not_found` found for struct `Vec
 103     let s = Struct::<f64>::default();
 104     s.method();
 105     //~^ ERROR the method `method` exists for struct `Struct<f64>`, but its trait bounds were not satisfied
 106 }