if (value.isMissing()) {
            setSupplier(noValueSupplier());
        } else if (value.hasFixedValue()) {
            setSupplier(new FixedSupplier<>(value.getFixedValue(), Cast.uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<T, C> asCollectingProvider = Cast.uncheckedNonnullCast(value.getChangingValue());

        if (value.isMissing()) {
            setSupplier(noValueSupplier());
        } else if (value.hasFixedValue()) {
            setSupplier(new FixedSupplier<>(uncheckedNonnullCast(value.getFixedValue()), uncheckedCast(value.getSideEffect())));
        } else {
            CollectingProvider<K, V> asCollectingProvider = uncheckedNonnullCast(value.getChangingValue());

    public void disallowUnsafeRead() {
        state.disallowUnsafeRead();
    }

    protected abstract S finalValue(EvaluationContext.ScopeContext context, S value, ValueConsumer consumer);

    protected void setSupplier(S supplier) {
        assertCanMutate();
        this.value = state.explicitValue(supplier);
    }

    protected void setConvention(S convention) {
        assertCanMutate();