Saxon

Testing name($result) = 'a'
Testing string($result) = ''
-s:saxon-new-attribute -t:new-attribute-02
A LazySequence can only be read once
java.lang.IllegalStateException: A LazySequence can only be read once
	at net.sf.saxon.om.LazySequence.iterate(LazySequence.java:54)
	at net.sf.saxon.om.LazySequence.head(LazySequence.java:40)
	at com.saxonica.functions.extfn.NewAttribute.call(NewAttribute.java:38)
	at com.saxonica.functions.extfn.NewAttribute.call(NewAttribute.java:18)
	at net.sf.saxon.expr.SystemFunctionCall$SystemFunctionCallElaborator.lambda$elaborateForPull$2(SystemFunctionCall.java:617)
	at net.sf.saxon.sxpath.XPathExpression.iterate(XPathExpression.java:176)
	at net.sf.saxon.s9api.XPathSelector.evaluate(XPathSelector.java:229)
	at net.sf.saxon.testdriver.QT3TestDriverHE.runTestCase(QT3TestDriverHE.java:590)
	at net.sf.saxon.testdriver.TestDriver.lambda$processTestSet$2(TestDriver.java:713)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at net.sf.saxon.s9api.streams.XdmStream.forEach(XdmStream.java:360)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at net.sf.saxon.s9api.streams.XdmStream.forEach(XdmStream.java:360)
	at net.sf.saxon.testdriver.TestDriver.processTestSet(TestDriver.java:707)
	at net.sf.saxon.testdriver.TestDriver.processCatalog(TestDriver.java:350)
	at net.sf.saxon.testdriver.TestDriver.go(TestDriver.java:236)
	at net.sf.saxon.testdriver.QT3TestDriverHE.go(QT3TestDriverHE.java:72)
	at com.saxonica.testdriver.QT3TestDriverPE.go(QT3TestDriverPE.java:59)
	at com.saxonica.testdriver.QT3TestDriverPE.main(QT3TestDriverPE.java:46)
Exception in thread "main" java.lang.NullPointerException: value
	at java.base/java.util.Objects.requireNonNull(Objects.java:246)
	at net.sf.saxon.s9api.XPathSelector.setVariable(XPathSelector.java:107)
	at net.sf.saxon.testdriver.TestOutcome.assertType(TestOutcome.java:501)
	at net.sf.saxon.testdriver.TestOutcome.testAssertion2(TestOutcome.java:390)
	at net.sf.saxon.testdriver.TestOutcome.testAssertion(TestOutcome.java:308)
	at net.sf.saxon.testdriver.TestOutcome.testAssertion2(TestOutcome.java:442)
	at net.sf.saxon.testdriver.TestOutcome.testAssertion(TestOutcome.java:308)
	at net.sf.saxon.testdriver.QT3TestDriverHE.runTestCase(QT3TestDriverHE.java:805)
	at net.sf.saxon.testdriver.TestDriver.lambda$processTestSet$2(TestDriver.java:713)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at net.sf.saxon.s9api.streams.XdmStream.forEach(XdmStream.java:360)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:274)
	at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at net.sf.saxon.s9api.streams.XdmStream.forEach(XdmStream.java:360)
	at net.sf.saxon.testdriver.TestDriver.processTestSet(TestDriver.java:707)
	at net.sf.saxon.testdriver.TestDriver.processCatalog(TestDriver.java:350)
	at net.sf.saxon.testdriver.TestDriver.go(TestDriver.java:236)
	at net.sf.saxon.testdriver.QT3TestDriverHE.go(QT3TestDriverHE.java:72)
	at com.saxonica.testdriver.QT3TestDriverPE.go(QT3TestDriverPE.java:59)
	at com.saxonica.testdriver.QT3TestDriverPE.main(QT3TestDriverPE.java:46)