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+error[E0277]: a value of type `i32` cannot be made by summing an iterator over elements of type `&()`
+ --> $DIR/sum.rs:4:25
+ |
+LL | vec![(), ()].iter().sum::<i32>();
+ | ^^^ 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: the method call chain might not have had the expected associated types
+ --> $DIR/sum.rs:4:18
+ |
+LL | vec![(), ()].iter().sum::<i32>();
+ | ------------ ^^^^^^ `Iterator::Item` is `&()` here
+ | |
+ | this expression has type `Vec<()>`
+note: required by a bound in `std::iter::Iterator::sum`
+ --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
+
+error[E0277]: a value of type `i32` cannot be made by multiplying all elements of type `&()` from an iterator
+ --> $DIR/sum.rs:7:25
+ |
+LL | vec![(), ()].iter().product::<i32>();
+ | ^^^^^^^ 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: the method call chain might not have had the expected associated types
+ --> $DIR/sum.rs:7:18
+ |
+LL | vec![(), ()].iter().product::<i32>();
+ | ------------ ^^^^^^ `Iterator::Item` is `&()` here
+ | |
+ | this expression has type `Vec<()>`
+note: required by a bound in `std::iter::Iterator::product`
+ --> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.