Rewriting function calls to have named parameters, default values

lambdas.kl

@@ -20,8 +20,11 @@ add_10 :: (size: int): int
   add_20 :: (new_size: int): int
     return 20
 
+  add :: (a: int, b: int = 10): int
+    return a + b
+
   constant :: 20; result := constant + 10
-  return add_20(result)
+  return add(a = 20)
 
 return_constant :: (): int
   constant :: 10