diff --git a/crates/ra_mbe/src/mbe_expander.rs b/crates/ra_mbe/src/mbe_expander.rs
index c7c06c7fd6..f185aecb71 100644
--- a/crates/ra_mbe/src/mbe_expander.rs
+++ b/crates/ra_mbe/src/mbe_expander.rs
@@ -599,7 +599,8 @@ mod tests {
         let macro_definition =
             source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-        let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap();
+        let (definition_tt, _) =
+            ast_to_token_tree(&macro_definition.token_tree().unwrap()).unwrap();
         crate::MacroRules::parse(&definition_tt).unwrap()
     }
 
@@ -611,7 +612,8 @@ mod tests {
         let macro_invocation =
             source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-        let (invocation_tt, _) = ast_to_token_tree(macro_invocation.token_tree().unwrap()).unwrap();
+        let (invocation_tt, _) =
+            ast_to_token_tree(&macro_invocation.token_tree().unwrap()).unwrap();
 
         expand_rule(&rules.rules[0], &invocation_tt)
     }
diff --git a/crates/ra_mbe/src/mbe_parser.rs b/crates/ra_mbe/src/mbe_parser.rs
index cddb4a7b4c..954b84d9d7 100644
--- a/crates/ra_mbe/src/mbe_parser.rs
+++ b/crates/ra_mbe/src/mbe_parser.rs
@@ -179,7 +179,8 @@ mod tests {
         let macro_definition =
             source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-        let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap();
+        let (definition_tt, _) =
+            ast_to_token_tree(&macro_definition.token_tree().unwrap()).unwrap();
         parse(&definition_tt)
     }
 
diff --git a/crates/ra_mbe/src/syntax_bridge.rs b/crates/ra_mbe/src/syntax_bridge.rs
index bfc351f81a..64ed6a517d 100644
--- a/crates/ra_mbe/src/syntax_bridge.rs
+++ b/crates/ra_mbe/src/syntax_bridge.rs
@@ -2,7 +2,7 @@ use crate::subtree_source::SubtreeTokenSource;
 use crate::ExpandError;
 use ra_parser::{ParseError, TreeSink};
 use ra_syntax::{
-    ast, AstNode, Parse, SmolStr, SyntaxElement, SyntaxKind, SyntaxKind::*, SyntaxNode,
+    ast, AstNode, AstToken, Parse, SmolStr, SyntaxElement, SyntaxKind, SyntaxKind::*, SyntaxNode,
     SyntaxTreeBuilder, TextRange, TextUnit, T,
 };
 use tt::buffer::{Cursor, TokenBuffer};
@@ -116,8 +116,6 @@ impl TokenMap {
 /// and strips the ending `*/`
 /// And then quote the string, which is needed to convert to `tt::Literal`
 fn doc_comment_text(comment: &ast::Comment) -> SmolStr {
-    use ast::AstToken;
-
     let prefix_len = comment.prefix().len();
     let mut text = &comment.text()[prefix_len..];
 
@@ -132,9 +130,8 @@ fn doc_comment_text(comment: &ast::Comment) -> SmolStr {
     text.into()
 }
 
-fn convert_doc_comment<'a>(token: &ra_syntax::SyntaxToken<'a>) -> Option<Vec<tt::TokenTree>> {
-    use ast::AstToken;
-    let comment = ast::Comment::cast(*token)?;
+fn convert_doc_comment(token: &ra_syntax::SyntaxToken) -> Option<Vec<tt::TokenTree>> {
+    let comment = ast::Comment::cast(token.clone())?;
     let doc = comment.kind().doc?;
 
     // Make `doc="\" Comments\""
@@ -245,7 +242,7 @@ fn convert_tt(
                 }
             }
             SyntaxElement::Node(node) => {
-                let child = convert_tt(token_map, global_offset, node)?.into();
+                let child = convert_tt(token_map, global_offset, &node)?.into();
                 token_trees.push(child);
             }
         };
diff --git a/crates/ra_mbe/src/tests.rs b/crates/ra_mbe/src/tests.rs
index 419b2c099c..38a31109d9 100644
--- a/crates/ra_mbe/src/tests.rs
+++ b/crates/ra_mbe/src/tests.rs
@@ -37,8 +37,8 @@ impl_froms!(TokenTree: Leaf, Subtree);
     let macro_invocation =
         source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-    let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap();
-    let (invocation_tt, _) = ast_to_token_tree(macro_invocation.token_tree().unwrap()).unwrap();
+    let (definition_tt, _) = ast_to_token_tree(&macro_definition.token_tree().unwrap()).unwrap();
+    let (invocation_tt, _) = ast_to_token_tree(&macro_invocation.token_tree().unwrap()).unwrap();
     let rules = crate::MacroRules::parse(&definition_tt).unwrap();
     let expansion = rules.expand(&invocation_tt).unwrap();
     assert_eq!(
@@ -53,7 +53,7 @@ pub(crate) fn create_rules(macro_definition: &str) -> MacroRules {
     let macro_definition =
         source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-    let (definition_tt, _) = ast_to_token_tree(macro_definition.token_tree().unwrap()).unwrap();
+    let (definition_tt, _) = ast_to_token_tree(&macro_definition.token_tree().unwrap()).unwrap();
     crate::MacroRules::parse(&definition_tt).unwrap()
 }
 
@@ -62,34 +62,25 @@ pub(crate) fn expand(rules: &MacroRules, invocation: &str) -> tt::Subtree {
     let macro_invocation =
         source_file.syntax().descendants().find_map(ast::MacroCall::cast).unwrap();
 
-    let (invocation_tt, _) = ast_to_token_tree(macro_invocation.token_tree().unwrap()).unwrap();
+    let (invocation_tt, _) = ast_to_token_tree(&macro_invocation.token_tree().unwrap()).unwrap();
 
     rules.expand(&invocation_tt).unwrap()
 }
 
-pub(crate) fn expand_to_items(
-    rules: &MacroRules,
-    invocation: &str,
-) -> ra_syntax::TreeArc<ast::MacroItems> {
+pub(crate) fn expand_to_items(rules: &MacroRules, invocation: &str) -> ast::MacroItems {
     let expanded = expand(rules, invocation);
-    token_tree_to_macro_items(&expanded).unwrap().tree().to_owned()
+    token_tree_to_macro_items(&expanded).unwrap().tree()
 }
 
 #[allow(unused)]
-pub(crate) fn expand_to_stmts(
-    rules: &MacroRules,
-    invocation: &str,
-) -> ra_syntax::TreeArc<ast::MacroStmts> {
+pub(crate) fn expand_to_stmts(rules: &MacroRules, invocation: &str) -> ast::MacroStmts {
     let expanded = expand(rules, invocation);
-    token_tree_to_macro_stmts(&expanded).unwrap().tree().to_owned()
+    token_tree_to_macro_stmts(&expanded).unwrap().tree()
 }
 
-pub(crate) fn expand_to_expr(
-    rules: &MacroRules,
-    invocation: &str,
-) -> ra_syntax::TreeArc<ast::Expr> {
+pub(crate) fn expand_to_expr(rules: &MacroRules, invocation: &str) -> ast::Expr {
     let expanded = expand(rules, invocation);
-    token_tree_to_expr(&expanded).unwrap().tree().to_owned()
+    token_tree_to_expr(&expanded).unwrap().tree()
 }
 
 pub(crate) fn text_to_tokentree(text: &str) -> tt::Subtree {
@@ -97,7 +88,7 @@ pub(crate) fn text_to_tokentree(text: &str) -> tt::Subtree {
     let wrapped = format!("wrap_macro!( {} )", text);
     let wrapped = ast::SourceFile::parse(&wrapped);
     let wrapped = wrapped.tree().syntax().descendants().find_map(ast::TokenTree::cast).unwrap();
-    let mut wrapped = ast_to_token_tree(wrapped).unwrap().0;
+    let mut wrapped = ast_to_token_tree(&wrapped).unwrap().0;
     wrapped.delimiter = tt::Delimiter::None;
 
     wrapped
@@ -164,8 +155,8 @@ pub(crate) fn assert_expansion(
 
     let (expanded_tree, expected_tree) = match kind {
         MacroKind::Items => {
-            let expanded_tree = token_tree_to_macro_items(&expanded).unwrap().tree().to_owned();
-            let expected_tree = token_tree_to_macro_items(&expected).unwrap().tree().to_owned();
+            let expanded_tree = token_tree_to_macro_items(&expanded).unwrap().tree();
+            let expected_tree = token_tree_to_macro_items(&expected).unwrap().tree();
 
             (
                 debug_dump_ignore_spaces(expanded_tree.syntax()).trim().to_string(),
@@ -174,8 +165,8 @@ pub(crate) fn assert_expansion(
         }
 
         MacroKind::Stmts => {
-            let expanded_tree = token_tree_to_macro_stmts(&expanded).unwrap().tree().to_owned();
-            let expected_tree = token_tree_to_macro_stmts(&expected).unwrap().tree().to_owned();
+            let expanded_tree = token_tree_to_macro_stmts(&expanded).unwrap().tree();
+            let expected_tree = token_tree_to_macro_stmts(&expected).unwrap().tree();
 
             (
                 debug_dump_ignore_spaces(expanded_tree.syntax()).trim().to_string(),
@@ -419,7 +410,7 @@ fn test_expand_to_item_list() {
             ",
     );
     let expansion = expand(&rules, "structs!(Foo, Bar);");
-    let tree = token_tree_to_macro_items(&expansion).unwrap().tree().to_owned();
+    let tree = token_tree_to_macro_items(&expansion).unwrap().tree();
     assert_eq!(
         tree.syntax().debug_dump().trim(),
         r#"
@@ -537,7 +528,7 @@ fn test_tt_to_stmts() {
     );
 
     let expanded = expand(&rules, "foo!{}");
-    let stmts = token_tree_to_macro_stmts(&expanded).unwrap().tree().to_owned();
+    let stmts = token_tree_to_macro_stmts(&expanded).unwrap().tree();
 
     assert_eq!(
         stmts.syntax().debug_dump().trim(),