This is the error you get:

```
[error] C:\Users\Peter\Documents\workspace\github\slick\slick-testkit\src\main\scala\com\typesafe\slick\testkit\tests\ColumnDefaultTest.scala:12: could not find implicit value for evidence parameter of type scala.slick.ast.TypedType[Some[Boolean]]
[error]     def b = column[Option[Boolean]]("b", O.Default(Some(true)))                                                                                                                                                                                
[error]                                                        ^                                                                                                                                                                                       
[error] one error found                                                                                                                                                                                                                                

```