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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
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LL | vec![(), ()].iter().sum::<i32>();
| ^^^ value of type `i32` cannot be made by summing a `std::iter::Iterator<Item=&()>`
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= 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
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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
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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
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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`.
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