syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let ty::Ref(_, ty, _) = closure_ty.kind() {
context_before:         let mut closure_env_projs = vec![];
context_after:             closure_env_projs.push(ProjectionElem::Deref);