fix forbid incompat with serde; missing_debug

https://github.com/rust-lang/rust/issues/81670

src/lib.rs

@@ -43,12 +43,8 @@
 //! an AST representation, or freely switch between them. To do so, use `cstree` to build syntax and underlying green
 //! tree and provide AST wrappers for your different kinds of nodes. An example of how this is done can be seen [here](https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/syntax/src/ast/generated.rs) and [here](https://github.com/rust-analyzer/rust-analyzer/blob/master/crates/syntax/src/ast/generated/nodes.rs) (note that the latter file is automatically generated by a task).
 
-#![forbid(
-    // missing_debug_implementations,
-    unconditional_recursion,
-    future_incompatible,
-)]
-#![deny(unsafe_code, missing_docs)]
+#![forbid(missing_debug_implementations, unconditional_recursion)]
+#![deny(unsafe_code, missing_docs, future_incompatible)]
 
 #[allow(unsafe_code)]
 mod green;

src/syntax/node.rs

@@ -23,6 +23,7 @@ use triomphe::Arc;
 /// Syntax nodes can be shared between threads.
 /// Every syntax tree is reference counted as a whole and nodes are pointer-sized, so copying
 /// individual nodes is relatively cheap.
+#[derive(Debug)]
 #[repr(transparent)]
 pub struct SyntaxNode<L: Language, D: 'static = ()> {
     data: *mut NodeData<L, D>,
@@ -983,7 +984,7 @@ impl<'n> Iter<'n> {
 }
 
 /// An iterator over the child nodes of a [`SyntaxNode`].
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct SyntaxNodeChildren<'n, L: Language, D: 'static = ()> {
     inner:  Iter<'n>,
     parent: &'n SyntaxNode<L, D>,
@@ -1014,7 +1015,7 @@ impl<'n, L: Language, D> Iterator for SyntaxNodeChildren<'n, L, D> {
 }
 
 /// An iterator over the children of a [`SyntaxNode`].
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct SyntaxElementChildren<'n, L: Language, D: 'static = ()> {
     inner:  Iter<'n>,
     parent: &'n SyntaxNode<L, D>,

src/syntax/token.rs

@@ -11,6 +11,7 @@ use super::*;
 use crate::{Direction, GreenNode, GreenToken, Language, SyntaxKind};
 
 /// Syntax tree token.
+#[derive(Debug)]
 pub struct SyntaxToken<L: Language, D: 'static = ()> {
     parent: SyntaxNode<L, D>,
     index:  u32,