1 files changed, 12 insertions, 2 deletions

diff --git a/crates/syntax/src/ast/make.rs b/crates/syntax/src/ast/make.rs
index 05a6b0b25..810c8d4c8 100644
--- a/crates/syntax/src/ast/make.rs
+++ b/crates/syntax/src/ast/make.rs
@@ -174,6 +174,11 @@ pub fn block_expr(
 pub fn expr_unit() -> ast::Expr {
     expr_from_text("()")
 }
+pub fn expr_literal(text: &str) -> ast::Literal {
+    assert_eq!(text.trim(), text);
+    ast_from_text(&format!("fn f() {{ let _ = {}; }}", text))
+}
+
 pub fn expr_empty_block() -> ast::Expr {
     expr_from_text("{}")
 }
@@ -390,6 +395,7 @@ pub fn token(kind: SyntaxKind) -> SyntaxToken {
     tokens::SOURCE_FILE
         .tree()
         .syntax()
+        .clone_for_update()
         .descendants_with_tokens()
         .filter_map(|it| it.into_token())
         .find(|it| it.kind() == kind)
@@ -544,6 +550,7 @@ pub mod tokens {
         SOURCE_FILE
             .tree()
             .syntax()
+            .clone_for_update()
             .descendants_with_tokens()
             .filter_map(|it| it.into_token())
             .find(|it| it.kind() == WHITESPACE && it.text() == " ")
@@ -569,13 +576,16 @@ pub mod tokens {
     }
 
     pub fn single_newline() -> SyntaxToken {
-        SOURCE_FILE
+        let res = SOURCE_FILE
             .tree()
             .syntax()
+            .clone_for_update()
             .descendants_with_tokens()
             .filter_map(|it| it.into_token())
             .find(|it| it.kind() == WHITESPACE && it.text() == "\n")
-            .unwrap()
+            .unwrap();
+        res.detach();
+        res
     }
 
     pub fn blank_line() -> SyntaxToken {