https://github.com/cmusphinx/sphinxbase/commit/6989c52a3fb9473fd61326e548440fff887525c2

commit 6989c52a3fb9473fd61326e548440fff887525c2
Author: Michel Zou <xantares09@hotmail.com>
Date:   Thu Feb 6 07:02:06 2020 +0100

    Fix doxy2swig.py IndexError: list index out of range

diff --git a/doc/doxy2swig.py b/doc/doxy2swig.py
index 5589b0d..a01c4b1 100644
--- a/doc/doxy2swig.py
+++ b/doc/doxy2swig.py
@@ -299,7 +299,10 @@ class Doxy2SWIG:
             name = first['name'].firstChild.data
 
             for n in node.getElementsByTagName('param'):
-              arg_type = n.getElementsByTagName('type')[0]
+              elts = n.getElementsByTagName('type')
+              if len(elts) == 0:
+                  continue
+              arg_type = elts[0]
               ref = self.get_specific_nodes(arg_type, ('ref'))
               if 'ref' in ref:
                 type_name = ref['ref'].firstChild.data
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<div class='path'>path: <a href='/guix/log/?id=88573dd928a854139c63508c5454056e42482c90'>root</a>/<a href='/guix/log/tests?id=88573dd928a854139c63508c5454056e42482c90'>tests</a>/<a href='/guix/log/tests/keys?id=88573dd928a854139c63508c5454056e42482c90'>keys</a>/<a href='/guix/log/tests/keys/ed25519.sec?id=88573dd928a854139c63508c5454056e42482c90'>ed25519.sec</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/keys/ed25519.sec?id=88573dd928a854139c63508c5454056e42482c90&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-22 10:53:19 +0100'>2021-12-22</span></td><td><a href='/guix/commit/tests/keys/ed25519.sec?id=9ebc9ca070a21ba0aeb3f61202a8071bb250ccc8'>tests: Move keys into ./tests/keys/ and add a third ed25519 key.</a><span class='msg-avail'>...</span></td><td>Attila Lendvai</td></tr>