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error[E0282]: type annotations needed for `(_,)`
--> $DIR/issue-20261.rs:4:11
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LL | for (ref i,) in [].iter() {
| --------- this method call resolves to `std::slice::Iter<'_, T>`
LL | i.clone();
| ^^^^^ cannot infer type
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= note: type must be known at this point
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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