Expr::Expr(const RDom &d) : contents(new ExprContents(makeVar((d[0].name())), Int(32))) {
contents->isRVar = true;
assert(d.dimensions() == 1 && "Can only use single-dimensional domains directly as expressions\n");
setRDom(d);
child(d[0].min());
child(d[0].size());
}
