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-rw-r--r--crates/hir-expand/src/lib.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/crates/hir-expand/src/lib.rs b/crates/hir-expand/src/lib.rs
index b5197d4c25d..6a122e0859c 100644
--- a/crates/hir-expand/src/lib.rs
+++ b/crates/hir-expand/src/lib.rs
@@ -220,6 +220,8 @@ pub enum MacroCallKind {
     },
     Attr {
         ast_id: AstId<ast::Item>,
+        // FIXME: This is being interned, subtrees can very quickly differ just slightly causing
+        // leakage problems here
         attr_args: Option<Arc<tt::Subtree>>,
         /// Syntactical index of the invoking `#[attribute]`.
         ///