in src/PartiallyGeneratedCode.hack [112:121]
public function extractGeneratedCode(): string {
$generated = varray[];
foreach ($this->iterateCodeSections($this->code) as $section) {
list($id, $chunk) = $section;
if ($id === null) {
$generated[] = $chunk;
}
}
return Str\join($generated, "\n");
}