Type safe method chaining that doesn't allow repeats of operations

Question

I want to implement method chaining like in those questions:

Best practice to implement Scala trait which supports method chaining ;

Scala DSL: method chaini

Answer 1

here you can ifnd an improved solution :

http://jim-mcbeath.blogspot.fr/2009/09/type-safe-builder-in-scala-part-3.html

(which actually relies on the phantom types)