Detect cases of unions-in-unions which were previously incorrectly compiled.
Detect cases of unions-in-unions which were previously incorrectly compiled.

Since simply fixing the bug would silently break backwards-compatibility for affected schemas, we instead throw an exception to alert developers.

See Issue #344 for more details.

hntrmrrs/capnproto,mrdomino/capnproto,pjulien/capnproto,hntrmrrs/capnproto,mologie/capnproto,mologie/capnproto,mrdomino/capnproto,pjulien/capnproto,hntrmrrs/capnproto,mrdomino/capnproto,pjulien/capnproto,mologie/capnproto