Index - U
| UnboundVariables | Nix.Type.Infer |
| uncurry | Nix.Utils |
| undefined | Nix.Utils |
| UndefinedElement | Nix.Frames, Nix |
| Underflow | Nix.Frames, Nix |
| unFix1 | Nix.Utils.Fix1 |
| unFix1T | Nix.Utils.Fix1 |
| unFreshIdT | Nix.Fresh |
| UnificationFail | Nix.Type.Infer |
| UnificationMismatch | Nix.Type.Infer |
| unify | Nix.Lint |
| uninterruptibleMask | Nix.Frames, Nix |
| uninterruptibleMask_ | Nix.Frames, Nix |
| unliftNValue | Nix.Value, Nix |
| unliftNValue' | Nix.Value, Nix |
| unliftNValueF | Nix.Value, Nix |
| unlines | Nix.Utils |
| Unmasked | Nix.Frames, Nix |
| unpackSymbolic | Nix.Lint |
| unPos | Nix.Expr.Types.Annotated, Nix.Expr, Nix |
| unsplitLines | Nix.Expr.Strings |
| unStorePath | Nix.Effects |
| until | Nix.Utils |
| unwords | Nix.Utils |
| unzip | Nix.Utils |
| unzip3 | Nix.Utils |
| uriAwareSplit | Nix.Utils |
| userError | Nix.Utils |
| UserInterrupt | Nix.Frames, Nix |