syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"ty:"}]}
source_snippet:                 ty: Ty::new_imm_ref(tcx, tcx.lifetimes.re_erased, var_ty),
context_before:                 mutability: Mutability::Not,
context_after:                 user_ty: None,