Index - U
| U2F | Cmm.Op |
| U2U | Cmm.Op |
| uArrow | Doc.Chars |
| UCharacter | FrontEnd.Lexer |
| UDiv | Cmm.Op |
| UGt | Cmm.Op |
| UGte | Cmm.Op |
| UIntTok | FrontEnd.Lexer |
| ulCorner | Doc.Chars |
| ULt | Cmm.Op |
| ULte | Cmm.Op |
| UMod | Cmm.Op |
| UMulx | Cmm.Op |
| unBox | FrontEnd.Tc.Monad |
| unboxedNameTuple | Name.Names |
| unboxedTuple | E.Values |
| UnboxedTuples | FlagOpts |
| unboxedTyUnit | E.Values |
| unboxedUnit | E.Values |
| UnboxedValues | FlagOpts |
| UndefinedName | FrontEnd.Warning |
| Underscore | FrontEnd.Lexer |
| unfoldKind | FrontEnd.Tc.Kind, FrontEnd.Tc.Type |
| unfoldr | Util.Util |
| Unification | FrontEnd.Diagnostic |
| UnificationError | FrontEnd.Warning |
| unificationError | FrontEnd.Tc.Monad |
| union | |
| 1 (Function) | Util.Util |
| 2 (Function) | Util.UnionFind |
| 3 (Function) | Util.TrueSet |
| 4 (Function) | Util.Histogram |
| 5 (Function) | Util.IntBag |
| 6 (Function) | Util.SetLike |
| unionBy | Util.Util |
| Unionize | Util.SetLike |
| unions | |
| 1 (Function) | Util.TrueSet |
| 2 (Function) | Util.Histogram |
| 3 (Function) | Util.SetLike |
| unionWith | Util.SetLike |
| union_ | Util.UnionFind |
| Uniq | Util.UniqueMonad |
| UniqT | Util.UniqueMonad |
| uniqueName | Util.NameMonad |
| UniqueProducer | GenUtil, Util.Gen |
| Unit | Grin.Grin |
| Unknown | E.Type, E.E |
| UnknownDeriving | FrontEnd.Warning |
| UnknownOption | FrontEnd.Warning |
| UnknownPragma | FrontEnd.Warning |
| UnknownType | Name.Name |
| unless | Util.Util, Util.RWS |
| unlines | Util.Util |
| unlit | FrontEnd.Unlit |
| UnOp | |
| 1 (Data Constructor) | Cmm.Op |
| 2 (Type/Class) | Cmm.Op |
| unOp | Cmm.OpEval |
| unopFloat | Cmm.Op |
| unpackPS | PackedString |
| Unparsable | |
| 1 (Type/Class) | Support.Unparse |
| 2 (Data Constructor) | Support.Unparse |
| Unparse | Support.Unparse |
| unparse | Support.Unparse |
| unparse' | Support.Unparse |
| unparseCat | Support.Unparse |
| unparseGroup | Support.Unparse |
| unRel | Util.Relation |
| unRename | FrontEnd.Rename |
| Unsafe | C.Prims, C.FFI |
| unsafeByteIndex | StringTable.Atom |
| unsafeCoerceOpt | E.Values |
| unsafeIntToAtom | StringTable.Atom |
| unsetProperty | Info.Types |
| UnsupportedFeature | FrontEnd.Warning |
| Unused | E.SSimplify |
| UnVar | FrontEnd.Tc.Type |
| unVar' | FrontEnd.Tc.Type |
| UnVarOpt | |
| 1 (Type/Class) | FrontEnd.Tc.Type |
| 2 (Data Constructor) | FrontEnd.Tc.Type |
| unwords | Util.Util |
| unzip | Util.Util |
| unzip3 | Util.Util |
| unzip4 | Util.Util |
| unzip5 | Util.Util |
| unzip6 | Util.Util |
| unzip7 | Util.Util |
| uoperator | C.Generate |
| updateChoHo | Ho.Collected |
| updateFuncDefProps | Grin.Grin |
| updateLetProps | Grin.Noodle |
| updateLit | DataConstructors |
| updateW | Util.UnionFind |
| urCorner | Doc.Chars |
| usedVars | E.Arbitrary |
| UserKinds | FlagOpts |
| UStringTok | FrontEnd.Lexer |
| u_instance | Name.Names |