syntax_data: {"ast_node_type":"variable","tokens":[{"end":34,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut this = Candidate {
context_before:     fn from_flat_pat(flat_pat: FlatPat<'tcx>, has_guard: bool) -> Self {
context_after:             match_pairs: flat_pat.match_pairs,