syntax_data: {"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let user_provided_types = self.typeck_results.user_provided_types();
context_before:             Res::Def(DefKind::Ctor(_, CtorKind::Const), def_id) => {
context_after:                 let user_ty = user_provided_types.get(expr.hir_id).copied().map(Box::new);