misc fixes

crates/syntax/src/syntax_editor.rs

@@ -150,6 +150,12 @@ impl SyntaxAnnotation {
     }
 }
 
+impl Default for SyntaxAnnotation {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 /// Position describing where to insert elements
 #[derive(Debug)]
 pub struct Position {
@@ -445,24 +451,6 @@ mod tests {
             .all(|element| element.ancestors().any(|it| &it == edit.root())))
     }
 
-    #[test]
-    #[should_panic = "some replace change ranges intersect: [Replace(Node(TUPLE_EXPR@5..7), Some(Node(NAME_REF@0..8))), Replace(Node(TUPLE_EXPR@5..7), Some(Node(NAME_REF@0..8)))]"]
-    fn fail_on_non_disjoint_single_replace() {
-        let root = make::match_arm([make::wildcard_pat().into()], None, make::expr_tuple([]));
-
-        let to_wrap = root.syntax().descendants().find_map(ast::TupleExpr::cast).unwrap();
-
-        let mut editor = SyntaxEditor::new(root.syntax().clone());
-
-        let name_ref = make::name_ref("var_name").clone_for_update();
-
-        // should die, ranges are not disjoint
-        editor.replace(to_wrap.syntax(), name_ref.syntax());
-        editor.replace(to_wrap.syntax(), name_ref.syntax());
-
-        let _ = editor.finish();
-    }
-
     #[test]
     fn test_insert_independent() {
         let root = make::block_expr(

crates/syntax/src/syntax_editor/edit_algo.rs

@@ -1,3 +1,5 @@
+//! Implementation of applying changes to a syntax tree.
+
 use std::{cmp::Ordering, collections::VecDeque, ops::RangeInclusive};
 
 use rowan::TextRange;
@@ -209,7 +211,7 @@ pub(super) fn apply_edits(editor: SyntaxEditor) -> SyntaxEdit {
                 }
             },
             Change::Replace(target, _) | Change::ReplaceWithMany(target, _) => {
-                *target = upmap_target(&target);
+                *target = upmap_target(target);
             }
             Change::ReplaceAll(range, _) => {
                 *range = upmap_target(range.start())..=upmap_target(range.end());
@@ -233,7 +235,7 @@ pub(super) fn apply_edits(editor: SyntaxEditor) -> SyntaxEdit {
             Change::Replace(target, None) => {
                 target.detach();
             }
-            Change::Replace(SyntaxElement::Node(target), Some(new_target)) if &target == &root => {
+            Change::Replace(SyntaxElement::Node(target), Some(new_target)) if target == root => {
                 root = new_target.into_node().expect("root node replacement should be a node");
             }
             Change::Replace(target, Some(new_target)) => {
@@ -288,7 +290,7 @@ struct ChangedAncestor {
 
 enum ChangedAncestorKind {
     Single { node: SyntaxNode },
-    Range { _changed_elements: RangeInclusive<SyntaxElement>, in_parent: SyntaxNode },
+    Range { _changed_elements: RangeInclusive<SyntaxElement>, _in_parent: SyntaxNode },
 }
 
 impl ChangedAncestor {
@@ -307,7 +309,7 @@ impl ChangedAncestor {
         Self {
             kind: ChangedAncestorKind::Range {
                 _changed_elements: range.clone(),
-                in_parent: range.start().parent().unwrap(),
+                _in_parent: range.start().parent().unwrap(),
             },
             change_index,
         }
@@ -316,7 +318,7 @@ impl ChangedAncestor {
     fn affected_range(&self) -> TextRange {
         match &self.kind {
             ChangedAncestorKind::Single { node } => node.text_range(),
-            ChangedAncestorKind::Range { _changed_elements: changed_nodes, in_parent: _ } => {
+            ChangedAncestorKind::Range { _changed_elements: changed_nodes, _in_parent: _ } => {
                 TextRange::new(
                     changed_nodes.start().text_range().start(),
                     changed_nodes.end().text_range().end(),
@@ -339,7 +341,7 @@ impl TreeMutator {
 
     fn make_element_mut(&self, element: &SyntaxElement) -> SyntaxElement {
         match element {
-            SyntaxElement::Node(node) => SyntaxElement::Node(self.make_syntax_mut(&node)),
+            SyntaxElement::Node(node) => SyntaxElement::Node(self.make_syntax_mut(node)),
             SyntaxElement::Token(token) => {
                 let parent = self.make_syntax_mut(&token.parent().unwrap());
                 parent.children_with_tokens().nth(token.index()).unwrap()

crates/syntax/src/syntax_editor/mapping.rs

@@ -1,3 +1,7 @@
+//! Maps syntax elements through disjoint syntax nodes.
+//!
+//! [`SyntaxMappingBuilder`] should be used to create mappings to add to a [`SyntaxEditor`]
+
 use itertools::Itertools;
 use rustc_hash::FxHashMap;
 
@@ -168,11 +172,11 @@ impl SyntaxMapping {
         match (input_mapping, input_ancestor) {
             (Some(input_mapping), _) => {
                 // A mapping exists at the input, follow along the tree
-                Some(self.upmap_child(&input_mapping, &input_mapping, &output_root))
+                Some(self.upmap_child(&input_mapping, &input_mapping, output_root))
             }
             (None, Some(input_ancestor)) => {
                 // A mapping exists at an ancestor, follow along the tree
-                Some(self.upmap_child(input, &input_ancestor, &output_root))
+                Some(self.upmap_child(input, &input_ancestor, output_root))
             }
             (None, None) => {
                 // No mapping exists at all, is the same position in the final tree