Function push_outlives_components 

pub fn push_outlives_components<I: Interner>(
    cx: I,
    ty: I::Ty,
    out: &mut SmallVec<[Component<I>; 4]>,
)

Push onto out all the things that must outlive 'a for the condition ty0: 'a to hold. Note that ty0 must be a fully resolved type.