Function rustc_next_trait_solver::solve::inspect::instantiate_canonical_state   
source ยท pub fn instantiate_canonical_state<D, I, T: TypeFoldable<I>>(
    delegate: &D,
    span: D::Span,
    param_env: I::ParamEnv,
    orig_values: &mut Vec<I::GenericArg>,
    state: CanonicalState<I, T>,
) -> Twhere
    D: SolverDelegate<Interner = I>,
    I: Interner,