syntax_data: {"ast_node_type":"other","tokens":[{"end":28,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // patterns.
context_before:                 // Extremely important check for all ADTs! Make sure they opted-in to be used in
context_after:                 debug!("adt_def {:?} has !type_marked_structural for cv.ty: {:?}", adt_def, ty);