[[Module:inflection/data/ru-noun/testcases/m-cdef]]

I think those may be a different type of module error than the ones normally found in testcases pages: User:Vitalik changed the directory structure without bothering to change the "require" statements to point to the new locations. I fixed a batch of them, but got tired of it. You would think that someone doing extended heavy module-programming work would check Category:Pages with module errors every once in a while, but I guess they would rather let us do it for them...