FilePath modification proposal

[Neil Mitchell]

> Can't something in the style of
>
>    https://hackage.haskell.org/package/doctest
>
> be used to avoid having to run a generator manually?

It would, but then instead of generating a file (pretty easy), I have
to go through the GHC API (a lot more fiddly). Alternatively, I could
just have the tester spit out a temporary .hs file and run over it in
one go - which works, but means all the nice Cabal stuff for
dependencies of the test suite get a bit lost and I have to assume a
"good" GHC on the $PATH. Both avoid checking in generated code, but
end up a bit more complex in other respects.

> Btw, Haddock has even markup support for QC properties via
> "prop>"-prefixed code-blocks.

Yes, but here I want slightly lighter weight properties (I infer what
is a variable and what isn't), and also multi-module properties (most
properties are tested against both .Windows and .Posix paths). I
almost always find I can get slightly cleaner tests by writing a
generator myself, and that the effort writing the generator is minimal
and reducing the difficulty of writing tests makes me write more of
them.

Thanks, Neil