syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // `rustc_insignificant_dtor`, even if the type itself doesn't have a `Drop` impl.
context_before:             // outside stdlib, we might choose to still annotate the wrapper (std HashMap) with
context_after:             Some(DtorType::Insignificant)