syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"dcx.emit_fatal(LoopMatchInvalidUpdate"}]}
source_snippet:                         dcx.emit_fatal(LoopMatchInvalidUpdate {
context_before:                     if local(self, state) != Some(scrutinee_hir_id) {
context_after:                             scrutinee: scrutinee.span,