syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"slice:"}]}
source_snippet:         slice: Option<&'tcx hir::Pat<'tcx>>,
context_before:         prefix: &'tcx [hir::Pat<'tcx>],
context_after:         suffix: &'tcx [hir::Pat<'tcx>],