in src/uriparameters/RequestParameterCodegenBuilder.hack [36:47]
final public static function getRequestSpec(
RequestParameter $param,
): classname<RequestParameterCodegenSpec> {
$specs = self::getParameterSpecs();
$type = \get_class($param);
invariant(
$specs->containsKey($type),
"Don't know how to render a %s",
$type,
);
return $specs->at($type);
}