Comment 0 for bug 1980767

Parsing incomplete XML raises an XMLSyntaxError. But if a bespoke target is used, it fails to instantiate the error:

    parser = etree.XMLParser(target=etree.TreeBuilder())
    etree.fromstring('<a><b></b>', parser=parser)

The following raises the error correctly:
    parser = etree.XMLParser()
    etree.fromstring('<a><b></b>', parser=parser)

It looks like TreeBuilder.close() calls (https://github.com/lxml/lxml/blob/master/src/lxml/saxparser.pxi#L820):

    raise XMLSyntaxAssertionError("missing end tags")

Which calls the XMLSyntaxError constructor with only two arguments (self and message) and not the expected 5.

Python : sys.version_info(major=3, minor=8, micro=13, releaselevel='final', serial=0)
lxml.etree : (4, 9, 1, 0)
libxml used : (2, 9, 14)
libxml compiled : (2, 9, 14)
libxslt used : (1, 1, 35)
libxslt compiled : (1, 1, 35)