From bbcca4f735870246c8ed8ce1a29af100e09b0a6f Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 22 Aug 2019 15:20:07 +0300
Subject: make ast object safe

---
 crates/ra_syntax/src/ast.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'crates/ra_syntax/src/ast.rs')

diff --git a/crates/ra_syntax/src/ast.rs b/crates/ra_syntax/src/ast.rs
index afdfca66e..a2f862869 100644
--- a/crates/ra_syntax/src/ast.rs
+++ b/crates/ra_syntax/src/ast.rs
@@ -25,15 +25,23 @@ pub use self::{
 /// conversion itself has zero runtime cost: ast and syntax nodes have exactly
 /// the same representation: a pointer to the tree root and a pointer to the
 /// node itself.
-pub trait AstNode: Clone {
-    fn can_cast(kind: SyntaxKind) -> bool;
+pub trait AstNode {
+    fn can_cast(kind: SyntaxKind) -> bool
+    where
+        Self: Sized;
 
     fn cast(syntax: SyntaxNode) -> Option<Self>
     where
         Self: Sized;
+
     fn syntax(&self) -> &SyntaxNode;
 }
 
+#[test]
+fn assert_ast_is_object_safe() {
+    fn _f(_: &dyn AstNode, _: &dyn NameOwner) {}
+}
+
 /// Like `AstNode`, but wraps tokens rather than interior nodes.
 pub trait AstToken {
     fn cast(token: SyntaxToken) -> Option<Self>
-- 
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