| editDistance | Options.Applicative.Help.Levenshtein, Options.Applicative.Help |
| eitherReader | Options.Applicative.Builder, Options.Applicative |
| empty | |
| 1 (Function) | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| 2 (Function) | Options.Applicative |
| enclose | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| encloseSep | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| enterContext | Options.Applicative.Internal |
| equals | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| errorHelp | Options.Applicative.Help.Core, Options.Applicative.Help |
| ErrorMsg | Options.Applicative.Types, Options.Applicative.Internal, Options.Applicative.Builder, Options.Applicative |
| errorP | Options.Applicative.Internal |
| evalParser | Options.Applicative.Common |
| execCompletion | Options.Applicative.Types, Options.Applicative.Extra, Options.Applicative |
| execFailure | Options.Applicative.Types, Options.Applicative.Extra, Options.Applicative |
| execParser | Options.Applicative.Extra, Options.Applicative |
| execParserMaybe | Options.Applicative.Extra |
| execParserPure | Options.Applicative.Extra, Options.Applicative |
| exitContext | Options.Applicative.Internal |
| exitP | Options.Applicative.Internal |
| ExpectsArgError | Options.Applicative.Types, Options.Applicative.Internal, Options.Applicative.Builder, Options.Applicative |
| extractChunk | Options.Applicative.Help.Chunk, Options.Applicative.Help |