ini lexer: Lexing literal_block '...' as "ini" resulted in an error at token: '}'

[ThomasWaldmann]

Describe the bug

A part of our docs that didn't change since quite a while suddenly causes a warning from the ini lexer and thus sphinx terminates with rc 1 (which leads to termination of our CI pipeline).

data-structures.rst:971: WARNING: Lexing literal_block '...' as "ini" resulted in an error at token: '}'.

Details (full text of the ini section) see there:

borgbackup/borg#8625

I didn't see anything problematic in that ini section, even the {} were nested correctly.

How to Reproduce

See the linked PR.

Environment Information

Platform:              darwin; (macOS-15.2-arm64-arm-64bit-Mach-O)
Python version:        3.13.1 (main, Dec  3 2024, 17:59:52) [Clang 16.0.0 (clang-1600.0.26.4)])
Python implementation: CPython
Sphinx version:        8.1.3
Docutils version:      0.21.2
Jinja2 version:        3.1.5
Pygments version:      2.19.0

Sphinx extensions

No response

Additional context

No response

[kartben]

https://pypi.org/project/Pygments/#history
Likely a regression/issue with latest Pygments release

[ThomasWaldmann]

pygments/pygments#2834