Index - U
| Unassoc | Predicate.Prelude, Predicate |
| Uncons | Predicate.Prelude, Predicate |
| Uncurry | Predicate.Prelude, Predicate |
| Unfoldr | Predicate.Prelude, Predicate |
| Ungreedy | Predicate.Util, Predicate |
| Unicode | Predicate.Util, Predicate |
| unlessNull | Predicate.Util, Predicate |
| UnMkDay | Predicate.Prelude, Predicate |
| UnMkTime | Predicate.Prelude, Predicate |
| Unproxy | Predicate.Prelude, Predicate |
| unRavelT | Predicate.Refined, Predicate |
| unRefined | Predicate.Refined, Predicate |
| unRefined1 | Predicate.Refined1 |
| unRefinedT | Predicate.Refined, Predicate |
| unsafeRefined | Predicate.Refined, Predicate |
| unsafeRefined' | Predicate.Refined, Predicate |
| unsafeRefined1 | Predicate.Refined1 |
| unsafeRefined1' | Predicate.Refined1 |
| unsafeRefined2 | Predicate.Refined2 |
| unsafeRefined2' | Predicate.Refined2 |
| unsafeRefined3 | Predicate.Refined3 |
| unsafeRefined3' | Predicate.Refined3 |
| Unsnoc | Predicate.Prelude, Predicate |
| Unwrap | Predicate.Prelude, Predicate |
| Unzip | Predicate.Prelude, Predicate |
| Unzip3 | Predicate.Prelude, Predicate |
| UTCTimeToPosix | Predicate.Prelude, Predicate |
| Utf8 | Predicate.Util, Predicate |