syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // WfReference
context_before:             ty::Ref(r, rty, _) => {
context_after:                 if !r.has_escaping_bound_vars() && !rty.has_escaping_bound_vars() {