[protobuf] Message extensions cannot have required fields.

[Anthony Sampton]

After the latest release (2.6.0) all my protos wouldn't compile.
Protoc gives me the following error: "Message extensions cannot have 
required fields."

Can anyone explain me why can't I use the required field in extention in 
the code below?

message MyMsgA { 
    extensions 100 to max; 
    required int32 i = 1; 
} 
 
message MyMsgB { 
    extend MyMsgA { 
        required MyMsgB b_data = 100; 
    } 
    required string s = 1; 
}


Thanks in advance.

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