syntax_data: {"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let trait_ref = if generics.count() == 1 {
context_before:                 let generics = cx.generics_of(did);
context_after:                     ty::TraitRef::new(cx, did, [self_ty])