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recurse into refs when comparing tys for diagnostics before:  after:  this diff from the test suite is also quite nice imo: ```diff `@@` -4,8 +4,8 `@@` error[E0308]: mismatched types LL | debug_assert_eq!(iter.next(), Some(value)); | ^^^^^^^^^^^ expected `Option<<I as Iterator>::Item>`, found `Option<&<I as Iterator>::Item>` | - = note: expected enum `Option<<I as Iterator>::Item>` - found enum `Option<&<I as Iterator>::Item>` + = note: expected enum `Option<_>` + found enum `Option<&_>` ```