Make Tree::changed_ranges return an Iterator instead of a Vec (#437)

* Make Tree::changed_ranges return an Iterator instead of a Vec

* Remove CBufferIter.free parameter

cli/src/tests/corpus_test.rs

@@ -337,7 +337,7 @@ fn check_consistent_sizes(tree: &Tree, input: &Vec<u8>) {
 }
 
 fn check_changed_ranges(old_tree: &Tree, new_tree: &Tree, input: &Vec<u8>) -> Result<(), String> {
-    let changed_ranges = old_tree.changed_ranges(new_tree);
+    let changed_ranges = old_tree.changed_ranges(new_tree).collect();
     let old_scope_sequence = ScopeSequence::new(old_tree);
     let new_scope_sequence = ScopeSequence::new(new_tree);
     old_scope_sequence.check_changes(&new_scope_sequence, &input, &changed_ranges)

cli/src/tests/parser_test.rs

@@ -767,7 +767,7 @@ fn test_parsing_with_a_newly_excluded_range() {
     );
 
     assert_eq!(
-        tree.changed_ranges(&first_tree),
+        tree.changed_ranges(&first_tree).collect::<Vec<_>>(),
         vec![
             // The first range that has changed syntax is the range of the newly-inserted text.
             Range {
@@ -837,7 +837,7 @@ fn test_parsing_with_a_newly_included_range() {
     );
 
     assert_eq!(
-        tree.changed_ranges(&first_tree),
+        tree.changed_ranges(&first_tree).collect::<Vec<_>>(),
         vec![Range {
             start_byte: first_code_end_index + 1,
             end_byte: second_code_end_index + 1,

cli/src/tests/tree_test.rs

@@ -370,7 +370,7 @@ fn get_changed_ranges(
 ) -> Vec<Range> {
     perform_edit(tree, source_code, &edit);
     let new_tree = parser.parse(&source_code, Some(tree)).unwrap();
-    let result = tree.changed_ranges(&new_tree);
+    let result = tree.changed_ranges(&new_tree).collect();
     *tree = new_tree;
     result
 }