Data update

Task/Mutual-recursion/Wren/mutual-recursion.wren

@@ -1,11 +1,9 @@
-var M  // forward declaration
-
 var F = Fn.new { |n|
     if (n == 0) return 1
     return n - M.call(F.call(n-1))
 }
 
-M = Fn.new { |n|
+var M = Fn.new { |n|
     if (n == 0) return 0
     return n - F.call(M.call(n-1))
 }