Sphinx :cpp:struct: references are broken

The documentation build in !2487 (merged) fails with

Type is struct, declType is class
failed

Exception occurred:
  File "/usr/local/lib/python3.7/site-packages/sphinx/domains/cpp.py", line 7217, in checkType
    assert False
AssertionError

Which is likely fixed in Sphinx 2.3.1 with https://github.com/sphinx-doc/sphinx/commit/b01de08e19c918fddd8645c431c071725a623042.

Edited Jan 24, 2020 by Ben Gamari

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