syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if let hir::ByRef::Yes(_) = mode.0 {
context_before:                 let var_ty = ty;
context_after:                     if let ty::Ref(_, rty, _) = ty.kind() {