1 files changed, 8 insertions, 1 deletions

diff --git a/crates/ra_syntax/src/ptr.rs b/crates/ra_syntax/src/ptr.rs
index 8665c8976..992034ef0 100644
--- a/crates/ra_syntax/src/ptr.rs
+++ b/crates/ra_syntax/src/ptr.rs
@@ -31,6 +31,13 @@ impl SyntaxNodePtr {
     pub fn kind(self) -> SyntaxKind {
         self.kind
     }
+
+    pub fn cast<N: AstNode>(self) -> Option<AstPtr<N>> {
+        if !N::can_cast(self.kind()) {
+            return None;
+        }
+        Some(AstPtr { raw: self, _ty: PhantomData })
+    }
 }
 
 /// Like `SyntaxNodePtr`, but remembers the type of node
@@ -80,7 +87,7 @@ fn test_local_syntax_ptr() {
     use crate::{ast, AstNode, SourceFile};
 
     let file = SourceFile::parse("struct Foo { f: u32, }").ok().unwrap();
-    let field = file.syntax().descendants().find_map(ast::NamedFieldDef::cast).unwrap();
+    let field = file.syntax().descendants().find_map(ast::RecordFieldDef::cast).unwrap();
     let ptr = SyntaxNodePtr::new(field.syntax());
     let field_syntax = ptr.to_node(file.syntax());
     assert_eq!(field.syntax(), &field_syntax);