public Builder mergeFrom(com.google.protobuf.DescriptorProtos.SourceCodeInfo other) {
        if (other == getDefaultInstance()) return this;
        if (locationBuilder_ == null) {
          if (!other.location_.isEmpty()) {
            if (location_.isEmpty()) {
              location_ = other.location_;
              bitField0_ = (bitField0_ & ~0x00000001);
            } else {
              ensureLocationIsMutable();
              location_.addAll(other.location_);
            }
            onChanged();
          }
        } else {
          if (!other.location_.isEmpty()) {
            if (locationBuilder_.isEmpty()) {
              locationBuilder_.dispose();
              locationBuilder_ = null;
              location_ = other.location_;
              bitField0_ = (bitField0_ & ~0x00000001);
              locationBuilder_ = 
                alwaysUseFieldBuilders ?
                   getLocationFieldBuilder() : null;
            } else {
              locationBuilder_.addAllMessages(other.location_);
            }
          }
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }