{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"(self.cx.element_type(src_ty),"}]}
            (self.cx.element_type(src_ty), self.cx.element_type(dest_ty))
            assert_eq!(self.cx.vector_length(src_ty), self.cx.vector_length(dest_ty));
        } else {