syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"self.lower_pattern_range(lo_expr,"}]}
source_snippet:                 self.lower_pattern_range(lo_expr, hi_expr, end, ty, span)
context_before:                 let (lo_expr, hi_expr) = (lo_expr.as_deref(), hi_expr.as_deref());
context_after:                     .unwrap_or_else(PatKind::Error)