tree e58f2d7e05b7401c4097773049a3303235019ae9
parent 8517608739cdd220b21acc89420e05ba0988d965
author Joe Tsai <joetsai@digital-static.net> 1576027683 -0800
committer Damien Neil <dneil@google.com> 1576038307 +0000

internal/impl: fix aberrant message detection logic

In very old messages predating the existence of the size cache or the
proto3 unknown fields, it is possible that the generated struct lacks both
XXX_ fields and ones tagged with "protobuf". This can happen with a message
that only contains oneofs. As such, check for the "protobuf_oneof" tag as well.

Change-Id: I1981cd7dde68aece1a013356b6bc91cc5529f951
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/210747
Reviewed-by: Damien Neil <dneil@google.com>