syntax_data: {"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let ty::Alias(ty::Free, _) = ty.kind() else { return ty };
context_before:     pub fn peel_off_free_alias_tys(self, mut ty: Ty<'tcx>) -> Ty<'tcx> {