Function rustc_trait_selection::infer::resolve::fully_resolve

pub fn fully_resolve<'tcx, T>(
    infcx: &InferCtxt<'tcx>,
    value: T
) -> Result<T, FixupError<'tcx>>where
    T: TypeFoldable<TyCtxt<'tcx>>,

Full type resolution replaces all type and region variables with their concrete results. If any variable cannot be replaced (never unified, etc) then an Err result is returned.