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*/ 
void doubleTree(struct node* node) { 
  struct node* oldLeft;
 
  if (node==NULL) return;
 
  // do the subtrees 
  doubleTree(node->left); 
  doubleTree(node->right);
 
  // duplicate this node to its left 
  oldLeft = node->left; 
  node->left = newNode(node->data); 
  node->left->left = oldLeft; 
} 

gnatgcc -c -pipe -O2 prog.adb
prog.adb:1:01: compilation unit expected
prog.adb:2:36: illegal character, replaced by "("
prog.adb:5:11: == should be =
prog.adb:8:18: invalid token
prog.adb:9:18: invalid token
prog.adb:12:17: invalid token
prog.adb:13:07: invalid token
prog.adb:14:07: invalid token
prog.adb:15:01: illegal character, replaced by ")"
gnatmake: "prog.adb" compilation error

Standard output is empty