I haven't seen this specifically, but I have seen other languages move common top level behaviors within functions into parameter lists. Ruby, dart, coffescrip

I haven't seen this specifically, but I have seen other languages move common top level behaviors within functions into parameter lists. Ruby, dart, coffescript allow setting of instance variables from the parameter list: class Example constructor: (@name) -> # do stuff class Example constructor: (name) -> @name = name # do stuff Jonathan Blow's language allows the `using` keyword in parameter list, which desugars in much the same way. I'm personally not a big fan of using this technique for pattern matching, but its better than requiring explicit match blocks everywhere (like Scala and rust).