From 219389360c0b20cd6b980072e08723b91fea2c9b Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Tue, 18 Jun 2024 21:32:50 +1000
Subject: [PATCH] Add a comment.

Something that was non-obvious to me.
---
 compiler/rustc_ast/src/ast.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index 9cb193b4a67..ca7f0363fa7 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -972,7 +972,9 @@ pub fn is_by_value(self) -> bool {
     }
 }
 
-/// A statement
+/// A statement. No `attrs` or `tokens` fields because each `StmtKind` variant
+/// contains an AST node with those fields. (Except for `StmtKind::Empty`,
+/// which never has attrs or tokens)
 #[derive(Clone, Encodable, Decodable, Debug)]
 pub struct Stmt {
     pub id: NodeId,