Index - O
| OneLineMode | Language.Haskell.Exts.Pretty, Language.Haskell.Exts.Annotated, Language.Haskell.Exts | 
| onsideIndent | Language.Haskell.Exts.Pretty, Language.Haskell.Exts.Annotated, Language.Haskell.Exts | 
| Op | |
| 1 (Type/Class) | Language.Haskell.Exts.Annotated.Syntax, Language.Haskell.Exts.Annotated | 
| 2 (Type/Class) | Language.Haskell.Exts.Syntax, Language.Haskell.Exts | 
| op | |
| 1 (Function) | Language.Haskell.Exts.Annotated.Build, Language.Haskell.Exts.Annotated | 
| 2 (Function) | Language.Haskell.Exts.Build, Language.Haskell.Exts | 
| OptionsPragma | |
| 1 (Data Constructor) | Language.Haskell.Exts.Annotated.Syntax, Language.Haskell.Exts.Annotated | 
| 2 (Data Constructor) | Language.Haskell.Exts.Syntax, Language.Haskell.Exts | 
| OverlappingInstances | Language.Haskell.Exts.Extension, Language.Haskell.Exts.Annotated, Language.Haskell.Exts | 
| OverloadedStrings | Language.Haskell.Exts.Extension, Language.Haskell.Exts.Annotated, Language.Haskell.Exts |