update gwion snippets

src/binary-trees.gw

@@ -2,7 +2,8 @@
 
 class final Tree {
   var int item;
-  late Tree left, right;
+  late Tree left;
+  late Tree right;
 
   operator new(int it, int depth) {
     it :=> item;
@@ -33,7 +34,7 @@ new Tree(0, maxDepth) :=> var Tree longLivedTree;
 #! iterations = 2 ** maxDepth
 1 :=> var int iterations;
 for (var int d; d < maxDepth; ++d)
-  2 *:=> iterations;
+  2 *=> iterations;
 
 minDepth :=> var int depth;
 while (depth < stretchDepth) {

src/for.gw

@@ -1,4 +1,4 @@
-var int list[0];
+var int[0] list;
 
 for (var int i; i < 1000000; ++i)
  list << i;

src/method-call.gw

@@ -8,7 +8,8 @@ class Toggle {
 }
 
 class NthToggle extends Toggle {
-  var int count, countMax;
+  var int count;
+  var int countMax;
   fun Toggle activate() {
     if(++count >= countMax) {
       (this $ Toggle).activate();