build(rust): vendor rnix parser crate

third_party/crates/rowan-0.16.1/src/green.rs

@@ -0,0 +1,42 @@
+mod node;
+mod token;
+mod element;
+mod builder;
+mod node_cache;
+
+use self::element::GreenElement;
+
+pub(crate) use self::{element::GreenElementRef, node::GreenChild};
+
+pub use self::{
+    builder::{Checkpoint, GreenNodeBuilder},
+    node::{Children, GreenNode, GreenNodeData},
+    node_cache::NodeCache,
+    token::{GreenToken, GreenTokenData},
+};
+
+/// SyntaxKind is a type tag for each token or node.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct SyntaxKind(pub u16);
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn assert_send_sync() {
+        fn f<T: Send + Sync>() {}
+        f::<GreenNode>();
+        f::<GreenToken>();
+        f::<GreenElement>();
+    }
+
+    #[test]
+    fn test_size_of() {
+        use std::mem::size_of;
+
+        eprintln!("GreenNode          {}", size_of::<GreenNode>());
+        eprintln!("GreenToken         {}", size_of::<GreenToken>());
+        eprintln!("GreenElement       {}", size_of::<GreenElement>());
+    }
+}