anchor.diff:      chmod -R o+r /usr/lib/swift
   
   RUN swift --version
  -
  -ENV GOLANG_VERSION 1.11.9
  -
  -RUN curl -O -L https://golang.org/dl/go${GOLANG_VERSION}.linux-amd64.tar.gz && \
  -    echo "e88aa3e39104e3ba6a95a4e05629348b4a1ec82791fb3c941a493ca349730608 *go${GOLANG_VERSION}.linux-amd64.tar.gz" | sha256sum -c - && \
  -    tar -C /usr/local -xzf go${GOLANG_VERSION}.linux-amd64.tar.gz && \
  -    rm go${GOLANG_VERSION}.linux-amd64.tar.gz
  -
  -ENV GOPATH $HOME
  -ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
  -
  -RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && \
  -    chmod -R 777 "$GOPATH"
  -
  -RUN go version
  
positive.code: FROM ubuntu:18.04
  
  ENV PROTOC_VERSION 3.7.1
  
  
negative.code:     cd .. && \
      rm -rf v${PROTOC_VERSION}.zip protobuf-${PROTOC_VERSION}
  
  ARG SWIFT_PLATFORM=ubuntu18.04
  ARG SWIFT_BRANCH=swift-5.0.1-release
  ARG SWIFT_VERSION=swift-5.0.1-RELEASE
  