[protobuf] Can an enum value be composed of another enum value?

[Phani Deepak Parasuramuni]

i have a use case where a first level of proto file declares a set of enum 
values and the secondary proto file that imports the primary level proto 
file, declares another set of enum values composed using the enum values 
from first level proto file.

*first.proto*:
syntax = "proto3";
enum Type {
     INVALID = 0;
     NUMERIC = 0xA0000;
     STATE   = 0xB0000;
     EVENT   = 0xC0000;
     BLOB    = 0xD0000;
};

*second.proto*:
syntax = "proto3";
import "first.proto";
enum ID {
     ID_INVALID = 0;
     ABC = NUMERIC | 0x1;
     DEF = STATE   | 0x2;
};

when second.proto is compiled, it fails with error: 
second.proto:5:12: Expected integer.
second.proto:6:12: Expected integer.

Any suggestions on how to workaround this problem?

Thanks,
Phani

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