syntax_data: {"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let rhs_ty = rhs.ty(&self.local_decls, self.tcx);
context_before:                 assert!(lhs_size.bits() <= 128);
context_after:                 let (rhs_size, _) = rhs_ty.int_size_and_signed(self.tcx);