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IPythonTracebackLexer errors on back ticks in the presence of line-breaks #14142
Description
We've run into this error when rendering notebooks in sphinx documentation via myst-nb. Error messages that include line-breaks and backticks lead to failed code highlighting. The result is a sphinx warning, which in our build configuration leads to a build failure.
Minimal reproduction:
from pygments import highlight
from IPython.lib.lexers import IPythonTracebackLexer
from pygments.formatters import HtmlFormatter
from pygments.filters import RaiseOnErrorTokenFilter
code = "TypeError: `foo` is deprecated.\nUse `bar` instead."
lexer = IPythonTracebackLexer(filters=[RaiseOnErrorTokenFilter()])
print(highlight(code, lexer, HtmlFormatter()))---------------------------------------------------------------------------
ErrorToken Traceback (most recent call last)
[<ipython-input-3-c8ff8ce8d25e>](https://localhost:8080/#) in <cell line: 8>()
6 code = "TypeError: `foo` is deprecated.\nUse `bar` instead."
7 lexer = IPythonTracebackLexer(filters=[RaiseOnErrorTokenFilter()])
----> 8 print(highlight(code, lexer, HtmlFormatter()))
8 frames
[/usr/local/lib/python3.10/dist-packages/pygments/filters/__init__.py](https://localhost:8080/#) in filter(self, lexer, stream)
783 for ttype, value in stream:
784 if ttype is Error:
--> 785 raise self.exception(value)
786 yield ttype, value
787
ErrorToken: `By contrast, the standard PythonTracebackLexer does not have issues with this:
from pygments.lexers import PythonTracebackLexer
lexer = PythonTracebackLexer(filters=[RaiseOnErrorTokenFilter()])
print(highlight(code, lexer, HtmlFormatter()))<div class="highlight"><pre><span></span><span class="x">TypeError: `foo` is deprecated.</span>
<span class="x">Use `bar` instead.</span>
</pre></div>
Activity
matthew-brett commentedon Aug 6, 2026
We ran into the same problem, one potential workaround at matthew-brett/scipy-lecture-notes@5be6ea5 .