In the bitcoin core file key.h there is a typo:
//! Check whether the 32-byte array pointed to be vch is valid keydata.
bool static Check(const unsigned char* vch);
The comment should read:
//! Check whether the 32-byte array pointed to by vch is valid keydata.
I am not registered so I cannot submit bugs. Maybe somebody who works with the code base can fix it.
Thanks for pointing this out-- only takes a second to register on github... but if you don't it'll get picked up eventually.
Please feel free to report any other issues you find (though best on github!)