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static int _rb_range(struct rb_tree *tree, struct rb_node *node, void *range, void *cookie,
	int (*comp)(const void *, const void *), int (*call)(void *, void *))
{
	int test, error;
 
	if (node != rb_nil(tree)) {
		test = comp(range, node->data);
		if (test <= 0) {
			if ((error = _rb_range(tree, node->left, range, cookie, comp, call)) != 0) {
				return error;
			}
			if (test < 0) {
				return 1;
			}
			if ((error = call(node->data, cookie)) != 0) {
				return error;
			}
		}
		if ((error = _rb_range(tree, node->right, range, cookie, comp, call)) != 0) {
			return error;
		}
	}
	return 0;
}
 
int rb_range(struct rb_tree *tree, void *range, void *cookie,
	int (*comp)(const void *, const void *), int (*call)(void *, void *))
{
	struct rb_node *node = rb_first(tree);
	int res;
 
	while (node != rb_nil(tree)) {
		if ((res = comp(range, node->data)) == 0) {
			return _rb_range(tree, node, range, cookie, comp, call);
		}
		node = res < 0 ? node->left : node->right;
	}
	return -1;
}
 

prog.c:1:51: warning: 'struct rb_node' declared inside parameter list
 static int _rb_range(struct rb_tree *tree, struct rb_node *node, void *range, void *cookie, int (*comp)(const void *, const void *), int (*call)(void *, void *))
                                                   ^
prog.c:1:51: warning: its scope is only this definition or declaration, which is probably not what you want
prog.c:1:51: warning: 'struct rb_tree' declared inside parameter list
prog.c: In function '_rb_range':
prog.c:5:14: warning: implicit declaration of function 'rb_nil' [-Wimplicit-function-declaration]
  if (node != rb_nil(tree)) {
              ^
prog.c:5:11: warning: comparison between pointer and integer
  if (node != rb_nil(tree)) {
           ^
prog.c:6:26: error: dereferencing pointer to incomplete type 'struct rb_node'
   test = comp(range, node->data);
                          ^
prog.c: At top level:
prog.c:30:21: warning: 'struct rb_tree' declared inside parameter list
 int rb_range(struct rb_tree *tree, void *range, void *cookie, int (*comp)(const void *, const void *), int (*call)(void *, void *))
                     ^
prog.c: In function 'rb_range':
prog.c:32:25: warning: implicit declaration of function 'rb_first' [-Wimplicit-function-declaration]
  struct rb_node *node = rb_first(tree);
                         ^
prog.c:32:25: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
prog.c:35:14: warning: comparison between pointer and integer
  while (node != rb_nil(tree)) {
              ^
prog.c:36:30: error: dereferencing pointer to incomplete type 'struct rb_node'
   if ((res = comp(range, node->data)) == 0) {
                              ^
prog.c:37:21: warning: passing argument 1 of '_rb_range' from incompatible pointer type [-Wincompatible-pointer-types]
    return _rb_range(tree, node, range, cookie, comp, call);
                     ^
prog.c:1:12: note: expected 'struct rb_tree *' but argument is of type 'struct rb_tree *'
 static int _rb_range(struct rb_tree *tree, struct rb_node *node, void *range, void *cookie, int (*comp)(const void *, const void *), int (*call)(void *, void *))
            ^
prog.c:37:27: warning: passing argument 2 of '_rb_range' from incompatible pointer type [-Wincompatible-pointer-types]
    return _rb_range(tree, node, range, cookie, comp, call);
                           ^
prog.c:1:12: note: expected 'struct rb_node *' but argument is of type 'struct rb_node *'
 static int _rb_range(struct rb_tree *tree, struct rb_node *node, void *range, void *cookie, int (*comp)(const void *, const void *), int (*call)(void *, void *))
            ^

Standard output is empty