There's already another syntax example in the thread, but I want to point out the weirdest syntax I've seen yet: positional arguments look like posix command arguments:

   greet name/string="World" --greeting/string="Hello" -> string:
     return "$greeting $name"

   main:
     print (greet)                         // Prints Hello World.
     print (greet "Ada" --greeting="Hi")    // Prints Hi Ada.