To amplify your "comma right after", the call can even be simply: some_function(proc(a: int): int = a, proc(b: int): int = b) And Nim lets you put ()s in

To amplify your "comma right after", the call can even be simply: some_function(proc(a: int): int = a, proc(b: int): int = b) And Nim lets you put ()s in a great many places to resolve problems. I find its syntax quite a bit nicer than Python, actually.