syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"expr_span,"}]}
source_snippet:                         expr_span,
context_before:                     self.tcx.dcx().span_delayed_bug(
context_after:                         format!("fn item without body has reached MIR building: {:?}", self.def_id),