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Implicit functions with several parameters are allowed, that is:
implicit def it(path: String, category: String):Iterator[String] = ...
But can the Scala compiler do something useful with it? If not, why doesn't it complain?
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Implicit parameters are the parameters that are passed to a function with implicit keyword in Scala, which means the values will be taken from the context in which they are called.
An implicit parameter list (implicit $p_1$,$\ldots$,$p_n$) of a method marks the parameters $p_1 , \ldots , p_n$ as implicit. A method or constructor can have only one implicit parameter list, and it must be the last parameter list given.
The implicit parameter in Java is the object that the method belongs to. It's passed by specifying the reference or variable of the object before the name of the method. An implicit parameter is opposite to an explicit parameter, which is passed when specifying the parameter in the parenthesis of a method call.
Scala 2.10 introduced a new feature called implicit classes. An implicit class is a class marked with the implicit keyword. This keyword makes the class's primary constructor available for implicit conversions when the class is in scope. Implicit classes were proposed in SIP-13.
Yes, the compiler can do something with it if you ask for such an implicit.
def f(implicit ev: (String, String) => Iterator[String]) = ...
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