syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"hi_expr:"}]}
source_snippet:         hi_expr: Option<&'tcx hir::PatExpr<'tcx>>,
context_before:         lo_expr: Option<&'tcx hir::PatExpr<'tcx>>,
context_after:         end: RangeEnd,