/* When we reach this place, POPSUB has already been called (with our fake
* argarray). GvAV(PL_defgv) points to the savearray (that is, what @_ was
* before uplevel). argarray is either the fake AV we created in su_uplevel()
* or some empty replacement POPSUB creates when @_ is reified. In both cases
* we have to destroy it before the context stack is swapped back to its
* original state. */
/* When we reach this place, POPSUB has already been called (with our fake
* argarray). GvAV(PL_defgv) points to the savearray (that is, what @_ was
* before uplevel). argarray is either the fake AV we created in su_uplevel()
* or some empty replacement POPSUB creates when @_ is reified. In both cases
* we have to destroy it before the context stack is swapped back to its
* original state. */