rust/src/test/ui/on-unimplemented/sum.stderr

error[E0277]: a value of type `i32` cannot be made by summing an iterator over elements of type `&()`
  --> $DIR/sum.rs:4:5
   |
LL |     vec![(), ()].iter().sum::<i32>();
   |     ^^^^^^^^^^^^^^^^^^^ --- required by a bound introduced by this call
   |     |
   |     value of type `i32` cannot be made by summing a `std::iter::Iterator<Item=&()>`
   |
   = help: the trait `Sum<&()>` is not implemented for `i32`
   = help: the following other types implement trait `Sum<A>`:
             <i32 as Sum<&'a i32>>
             <i32 as Sum>
note: required by a bound in `std::iter::Iterator::sum`
  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
   |
LL |         S: Sum<Self::Item>,
   |            ^^^^^^^^^^^^^^^ required by this bound in `Iterator::sum`

error[E0277]: a value of type `i32` cannot be made by multiplying all elements of type `&()` from an iterator
  --> $DIR/sum.rs:7:5
   |
LL |     vec![(), ()].iter().product::<i32>();
   |     ^^^^^^^^^^^^^^^^^^^ ------- required by a bound introduced by this call
   |     |
   |     value of type `i32` cannot be made by multiplying all elements from a `std::iter::Iterator<Item=&()>`
   |
   = help: the trait `Product<&()>` is not implemented for `i32`
   = help: the following other types implement trait `Product<A>`:
             <i32 as Product<&'a i32>>
             <i32 as Product>
note: required by a bound in `std::iter::Iterator::product`
  --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
   |
LL |         P: Product<Self::Item>,
   |            ^^^^^^^^^^^^^^^^^^^ required by this bound in `Iterator::product`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.