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When coercing &'?0 <Vec<{integer}> as IntoIterator>::IntoIter into &'?1 dyn Iterator<Item=i32>, we end up with two responses.
The first has a type-outlives constraint like <Vec<{integer}> as IntoIterator>::IntoIter: &'?1, and the second has one like std::vec::IntoIter<{integer}>: &'?1. These are identical except for their types being normalized, but that causes us to flounder.