src/test/ui/traits/suggest-where-clause.rs

   1 use std::mem;
   2
   3 struct Misc<T:?Sized>(T);
   4
   5 fn check<T: Iterator, U: ?Sized>() {
   6     // suggest a where-clause, if needed
   7     mem::size_of::<U>();
   8     //~^ ERROR the size for values of type
   9
  10     mem::size_of::<Misc<U>>();
  11     //~^ ERROR the size for values of type
  12
  13     // ... even if T occurs as a type parameter
  14
  15     <u64 as From<T>>::from;
  16     //~^ ERROR `u64: From<T>` is not satisfied
  17
  18     <u64 as From<<T as Iterator>::Item>>::from;
  19     //~^ ERROR `u64: From<<T as Iterator>::Item>` is not satisfied
  20
  21     // ... but not if there are inference variables
  22
  23     <Misc<_> as From<T>>::from;
  24     //~^ ERROR `Misc<_>: From<T>` is not satisfied
  25
  26     // ... and also not if the error is not related to the type
  27
  28     mem::size_of::<[T]>();
  29     //~^ ERROR the size for values of type
  30
  31     mem::size_of::<[&U]>();
  32     //~^ ERROR the size for values of type
  33 }
  34
  35 fn main() {
  36 }