Does anyone know of a publicly available C source file specifically constructed for testing the edge cases of C-language parsers?

I'm writing a parser for the C-language (and yes; I need to write my own), and I sat down to think of a good way to test it.

My conclusion is that rather than just feeding it it reams and reams of C sources; most of which will simply be re-exercising the same paths; it would be better to try and construct a single, preferably relatively small, C-source that doesn't necessarily have to do anything useful, but simply uses all the constructs and language features that I need to support. (Which isn't the full standard; any of them.)

I started to try and write notes on everything I think need to be in this file -- and I will continue that -- but then I thought maybe such a file already exists. I've done a few half-hearted searches for something that might fit the bill; but its proven to be a difficult thing to construct a discriminative search criteria for.

So, this is just a hope that maybe someone here has knowledge of something that might lend itself to my purpose.