Index - U
| unaryOp | Language.Scheme.Primitives |
| UnboundVar | Language.Scheme.Types |
| unpackBool | Language.Scheme.Primitives |
| unpackEquals | Language.Scheme.Primitives |
| unpackNum | Language.Scheme.Numerical |
| unpackStr | Language.Scheme.Primitives |
| unwordsList | Language.Scheme.Types |
| updateVector | Language.Scheme.Core |