freemarker-core/src/main/java/freemarker/core/BuiltInsForSequences.java [1074:1096]:
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                            boolean prefetchDone;
                            TemplateModel prefetchedElement;
                            boolean prefetchedEndOfIterator;

                            @Override
                            public TemplateModel next() throws TemplateModelException {
                                ensurePrefetchDone();
                                if (prefetchedEndOfIterator) {
                                    throw new IllegalStateException("next() was called when hasNext() is false");
                                }
                                prefetchDone = false;
                                return prefetchedElement;
                            }

                            @Override
                            public boolean hasNext() throws TemplateModelException {
                                ensurePrefetchDone();
                                return !prefetchedEndOfIterator;
                            }

                            private void ensurePrefetchDone() throws TemplateModelException {
                                if (prefetchDone) {
                                    return;
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freemarker-core/src/main/java/freemarker/core/BuiltInsForSequences.java [1293:1315]:
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                            boolean prefetchDone;
                            TemplateModel prefetchedElement;
                            boolean prefetchedEndOfIterator;

                            @Override
                            public TemplateModel next() throws TemplateModelException {
                                ensurePrefetchDone();
                                if (prefetchedEndOfIterator) {
                                    throw new IllegalStateException("next() was called when hasNext() is false");
                                }
                                prefetchDone = false;
                                return prefetchedElement;
                            }

                            @Override
                            public boolean hasNext() throws TemplateModelException {
                                ensurePrefetchDone();
                                return !prefetchedEndOfIterator;
                            }

                            private void ensurePrefetchDone() throws TemplateModelException {
                                if (prefetchDone) {
                                    return;
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