Saxon

Consider this stylesheet:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:xs="http://www.w3.org/2001/XMLSchema"
                xmlns:t="http://example.com/templates"
                exclude-result-prefixes="#all"
                version="3.0">

<xsl:output omit-xml-declaration="yes"/>

<xsl:use-package name="http://example.com/funcsynopsis"
                 package-version="'2.0.5'"/>


<xsl:template match="funcsynopsis">
  <xsl:call-template name="t:funcsynopsis"/>
</xsl:template>

</xsl:stylesheet>

It produces:

Error at xsl:use-package on line 11 column 45 of pcustom.xsl:
  XTSE0020  Error in package-version: For input string: "'2"
java.lang.NullPointerException
        at net.sf.saxon.trans.packages.PackageLibrary.findPackage(PackageLibrary.java:183)
        at net.sf.saxon.style.XSLUsePackage.findUsedPackage(XSLUsePackage.java:49)
        at net.sf.saxon.style.PrincipalStylesheetModule.gatherOverridingDeclarations(PrincipalStylesheetModule.java:531)
        at net.sf.saxon.style.PrincipalStylesheetModule.spliceUsePackages(PrincipalStylesheetModule.java:493)
        at net.sf.saxon.style.PrincipalStylesheetModule.preprocess(PrincipalStylesheetModule.java:330)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:288)
        at net.sf.saxon.style.StylesheetModule.loadStylesheet(StylesheetModule.java:254)
        at net.sf.saxon.style.Compilation.compileSingletonPackage(Compilation.java:113)
        at net.sf.saxon.s9api.XsltCompiler.compile(XsltCompiler.java:838)
        at net.sf.saxon.Transform.doTransform(Transform.java:753)
        at net.sf.saxon.Transform.main(Transform.java:82)
Fatal error during transformation: java.lang.NullPointerException:  (no message)