syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"span_bug!(base.span,"}]}
source_snippet:                                             span_bug!(base.span, "unexpected res: {:?}", res);
context_before:                                         hir::StructTailExpr::Base(base) => {
context_after:                                         }