[PyQt] Segfault in SIP 4.19.6

[Scott Talbert]

I'm seeing a segmentation fault in SIP 4.19.6 when running sip on 
wxPython Phoenix.

Command line:
/usr/bin/sip -w -o -g -I 
/home/fedora/swt2c/wxPython-4.0.0rc1.dev3597+5f1ee01/src -I 
/home/fedora/swt2c/wxPython-4.0.0rc1.dev3597+5f1ee01/sip/gen -c 
/tmp/tmpATp7q5 -b sip/cpp/_core.sbf -X pycode_core:wx/core.py 
sip/gen/_core.sip

Stack trace:
#0  prEnumMemberScope (fp=fp at entry=0x55b4139e5ed0, emd=<optimized out>)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/gencode.c:15541
#1  0x000055b4120b427c in generateCastZero (fp=fp at entry=0x55b4139e5ed0,
     ad=<optimized out>, ad=<optimized out>)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/gencode.c:7588
#2  0x000055b4120b4a14 in generateVirtualHandler (
     mod=mod at entry=0x55b4139e6180, vhd=vhd at entry=0x55b41578c8e0,
     fp=fp at entry=0x55b4139e5ed0)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/gencode.c:8115
#3  0x000055b4120c51ee in generateCpp (pt=pt at entry=0x7fff082c53a0,
     mod=0x55b4139e6180, codeDir=codeDir at entry=0x7fff082c737a 
"/tmp/tmpATp7q5",
     srcSuffix=srcSuffix at entry=0x55b4120e7e67 ".cpp", parts=parts at entry=0,
     needed_qualifiers=needed_qualifiers at entry=0x0, xsl=0x0, py_debug=0)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/gencode.c:1563
#4  0x000055b4120c93e1 in generateCode (pt=0x7fff082c53a0,
     codeDir=0x7fff082c737a "/tmp/tmpATp7q5",
     buildFile=0x7fff082c738c "sip/cpp/_core.sbf", docFile=<optimized out>,
     srcSuffix=0x55b4120e7e67 ".cpp", except=<optimized out>, trace=0,
     releaseGIL=1, parts=0, needed_qualifiers=0x0, xsl=0x0, consModule=0x0,
     docs=1, py_debug=0)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/gencode.c:351
#5  0x000055b4120ab40a in main (argc=15, argv=0x7fff082c56b8)
     at /usr/src/debug/sip-4.19.6-4.fc28.x86_64/sipgen/main.c:285