syntax_data: {"ast_node_type":"variable","tokens":[{"end":26,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let instance =
context_before:         if let &ty::FnDef(did, substs) = ty.kind() {
context_after:                 ty::Instance::expect_resolve(self.tcx, self.typing_env, did, substs, DUMMY_SP);