Remove unnecessary details from error messages
Remove unnecessary details from error messages

pjulien/capnproto,pjulien/capnproto,mologie/capnproto,jparyani/capnproto,rcrowder/capnproto,hntrmrrs/capnproto,hntrmrrs/capnproto,jparyani/capnproto,vladon/capnproto,maurer/capnproto,maurer/capnproto,vladon/capnproto,mrdomino/capnproto,rcrowder/capnproto,mologie/capnproto,mrdomino/capnproto,mologie/capnproto,maurer/capnproto,vladon/capnproto,pjulien/capnproto,hntrmrrs/capnproto,jparyani/capnproto,rcrowder/capnproto,mrdomino/capnproto