syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let parent_data = &self.syntax_context_data[parent.0 as usize];
context_before:         // and `parent_opaque_and_semiopaque` == `parent` if the expn contains only (semi-)opaques.
context_after:         assert_ne!(parent_data.dollar_crate_name, sym::dummy);