Index - U
| uncurry | Prelude | 
| undefined | Prelude | 
| unfoldr | List | 
| union | List | 
| unionBy | List | 
| unless | Monad | 
| unlines | Prelude, List | 
| unsafeForeignPtrToPtr | ForeignPtr | 
| unsafeShiftL | Bits | 
| unsafeShiftR | Bits | 
| until | Prelude | 
| unwords | Prelude, List | 
| unzip | Prelude, List | 
| unzip3 | Prelude, List | 
| unzip4 | List | 
| unzip5 | List | 
| unzip6 | List | 
| unzip7 | List | 
| userError | Prelude, IO | 
| userErrorType | MarshalError |