Version 222 is out.

Hi all,

TXR 222 is out. Binaries at Bintray.

• FFI now supports self-referential structs/unions.
• FFI can automatically pass a linked list of structures to a foreign function, and recover an updated version of that list when the function returns.
• A null pointer handling bug is fixed in FFI.
• Minor diagnostic flaw fixed  in the parser.

Cheers ...