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require_once 'Lisphp/Applicable.php';
require_once 'Lisphp/List.php';
require_once 'Lisphp/Scope.php';
final class Lisphp_Runtime_Setf implements Lisphp_Applicable {
function apply(Lisphp_Scope $scope, Lisphp_List $arguments) {
$name = $arguments[0];
if ($name instanceof Lisphp_Symbol) {
$retval = $arguments[1]->evaluate($scope);
} else {
throw new InvalidArgumentException(
'first operand of setf! form must be symbol'
return $scope[$name] = $retval;
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