| BackQuote | Language.Haskell.Exts.Lexer, Language.Haskell.Exts |
| Backslash | Language.Haskell.Exts.Lexer, Language.Haskell.Exts |
| BangedTy | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| BangPatterns | Language.Haskell.Exts.Extension, Language.Haskell.Exts |
| BangType | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| bang_name | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| Bar | Language.Haskell.Exts.Lexer, Language.Haskell.Exts |
| baseFixities | Language.Haskell.Exts.Fixity, Language.Haskell.Exts |
| baseLanguage | Language.Haskell.Exts.Parser, Language.Haskell.Exts |
| BDecls | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| BinaryLiterals | Language.Haskell.Exts.Extension, Language.Haskell.Exts |
| Binds | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| binds | Language.Haskell.Exts.Build, Language.Haskell.Exts |
| BlockArguments | Language.Haskell.Exts.Extension, Language.Haskell.Exts |
| BooleanFormula | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| Boxed | |
| 1 (Type/Class) | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| 2 (Data Constructor) | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| Bracket | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |
| BracketExp | Language.Haskell.Exts.Syntax, Language.Haskell.Exts |