{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"if"}]}
        if self.ctfe_mode.is_some_and(|c| !c.allow_immutable_unsafe_cell()) {
        // Special check for CTFE validation, preventing `UnsafeCell` inside unions in immutable memory.
            // Unsized unions are currently not a thing, but let's keep this code consistent with