syntax_data: {"ast_node_type":"variable","tokens":[{"end":90,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let ty = self.infcx.shallow_resolve(args.as_closure().tupled_upvars_ty());
context_before:             ty::Closure(_, args) => {
context_after:                 ty::Binder::dummy(AutoImplConstituents { types: vec![ty], assumptions: vec![] })