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error[E0277]: a value of type `f32` cannot be made by summing an iterator over elements of type `{integer}`
--> $DIR/invalid-iterator-chain-with-int-infer.rs:2:41
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LL | let x = Some(()).iter().map(|()| 1).sum::<f32>();
| ^^^ value of type `f32` cannot be made by summing a `std::iter::Iterator<Item={integer}>`
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= help: the trait `Sum<{integer}>` is not implemented for `f32`
= help: the following other types implement trait `Sum<A>`:
<f32 as Sum<&'a f32>>
<f32 as Sum>
note: the method call chain might not have had the expected associated types
--> $DIR/invalid-iterator-chain-with-int-infer.rs:2:29
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LL | let x = Some(()).iter().map(|()| 1).sum::<f32>();
| -------- ------ ^^^^^^^^^^^ `Iterator::Item` changed to `{integer}` here
| | |
| | `Iterator::Item` is `&()` here
| this expression has type `Option<()>`
note: required by a bound in `std::iter::Iterator::sum`
--> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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