syntax_data: {"ast_node_type":"other","tokens":[{"end":5,"kind":"keyword","start":0,"text":"{"}]}
source_snippet:     {
context_before:         OP: FnOnce(&mut Self) -> R,
context_after:         self.tcx().dep_graph.with_anon_task(self.tcx(), dep_kinds::TraitSelect, || op(self))