Another CPP gotcha for the manual

[Daniel Trstenjak]

> An example in the wild is in the package wai-extra, in the
file Network/Wai/Middleware/RequestLogger.hs where the */* construct
appears twice in the comments.

An even more common case could be the operator '//' of the vector package.
cpp also removes C++ style comments.

I once almost got crazy finding this kind issue,
because the resulting code still type checked.

Greetings,
Daniel
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