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1. checkMapMaybe :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf.Parser

   Like checkMapEither but without a helpful error message. Prefer checkMapEither.

2. checkMapMaybeForgivable :: HasCallStack => (a -> Maybe b) -> Parser a -> Parser b

   opt-env-conf	OptEnvConf.Parser

   Like checkMapMaybe, but allow trying the other side of any alternative if the result is Nothing.

3. checkMaybe :: HasCallStack => (a -> Maybe a) -> Parser a -> Parser a

   opt-env-conf	OptEnvConf.Parser

   Like checkMapMaybe but without changing the type

4. mapMaybeBuilder :: (BuildInstruction a -> Maybe (BuildInstruction b)) -> Builder a -> Builder b

   opt-env-conf	OptEnvConf.Setting

   No documentation available.

5. makeRelativeMaybe :: (System os, FileDir fd) => AbsDir os -> AbsPath os fd -> Maybe (RelPath os fd)

   pathtype	System.Path

   No documentation available.

6. makeRelativeMaybe :: (System os, FileDir fd) => AbsDir os -> AbsPath os fd -> Maybe (RelPath os fd)

   pathtype	System.Path.Generic

   No documentation available.

7. ByMaybeAttr :: WhyNullable

   persistent-mtl	Database.Persist.Sql.Shim

   No documentation available.

8. FieldAttrMaybe :: FieldAttr

   persistent-mtl	Database.Persist.Sql.Shim

   The Maybe keyword goes after the type. This indicates that the column is nullable, and the generated Haskell code will have a Maybe type for it. Example:

   User
   name Text Maybe
   

9. isFieldMaybe :: FieldDef -> Bool

   persistent-mtl	Database.Persist.Sql.Shim

   Check if the field is `Maybe a`

10. ByMaybeAttr :: WhyNullable

    persistent-redis	Database.Persist.Redis

    No documentation available.

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