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When encountering a type that does not have a MessageInfo, don't assume that it's a legacy message that doesn't implement proto.Message. Add a set of test messages exercising this case (panics prior to the internal/impl change). Change-Id: Ic1ec5ecfbe92278fbef44284ff52a0e0622a158c Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/182477 Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>