syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let span = this.thir.exprs[state].span;
context_before:                 if !is_supported_loop_match_type(state_ty) {
context_after:                     this.tcx.dcx().emit_fatal(LoopMatchUnsupportedType { span, ty: state_ty })