anchor.diff:  
   RUN go get -d -u github.com/golang/protobuf/protoc-gen-go && \
       go install github.com/golang/protobuf/protoc-gen-go && \
  -    ln -s /root/go/bin/protoc-gen-go /usr/local/bin/protoc-gen-go
  +    ln -s /root/go/bin/protoc-gen-go /usr/local/bin/protoc-gen-go && \
  +    go get -d -u github.com/pseudomuto/protoc-gen-doc/cmd/protoc-gen-doc && \
  +    ln -s /root/go/bin/protoc-gen-doc /usr/local/bin/protoc-gen-doc
   
   ENV GRPC_WEB_VERSION 1.0.4
   RUN curl -O -L https://github.com/grpc/grpc-web/releases/download/${GRPC_WEB_VERSION}/protoc-gen-grpc-web-${GRPC_WEB_VERSION}-linux-x86_64 && \
  
positive.code: 
  RUN swift --version
  
  ENV GRPC_JAVA_VERSION 1.20.0
  RUN curl -LO https://github.com/grpc/grpc-java/archive/v${GRPC_JAVA_VERSION}.tar.gz && \
      tar xf v${GRPC_JAVA_VERSION}.tar.gz && \
      cd grpc-java-${GRPC_JAVA_VERSION}/compiler && \
  
negative.code: 
  FROM golang:1.11-stretch as golang
  
  FROM quay.io/hirokazumiyaji/protobuf:3.8.0
  
  RUN mkdir -p /opt/java
  COPY --from=java /opt/java/openjdk /opt/java/openjdk
  