syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"tys.last().and_then(|&ty|"}]}
source_snippet:             tys.last().and_then(|&ty| sizedness_constraint_for_ty(tcx, sizedness, ty))
context_before:         ty::Tuple(tys) => {
context_after:         }