syntax_data: {"ast_node_type":"import","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // implementation, running this pass may cause otherwise-valid code to not compile.
context_before:         // This pass emits new panics. If for whatever reason we do not have a panic
context_after:         if tcx.lang_items().get(LangItem::PanicImpl).is_none() {