let regions = (region VariadicRegion<AnyRegion>:$body);

  let skipDefaultBuilders = 1;

  let builders = [
    OpBuilder<(ins "StringRef":$name, "FunctionType":$type,
      CArg<"ArrayRef<NamedAttribute>", "{}">:$attrs)>
  ];

  let extraClassDeclaration = [{
    LogicalResult verifyType() { return success(); }

    mlir::Region *getCallableRegion();