title: Docker on Windows does not support COPY --from?
body: <p>I am trying to make use of this Docker construct:</p>
  
  <blockquote>
    <p>Optionally a name can be given to a new build stage by adding AS name
    to the FROM instruction. The name can be used in subsequent FROM and
    COPY --from= instructions to refer to the image built in
    this stage.</p>
  </blockquote>
  
  <p>But I get this message:</p>
  
  <pre><code>COPY failed: stat /var/lib/docker/tmp/docker-builder869050639/-–from=build-env: 
  no such file or directory
  </code></pre>
  
  <p>Is copying files from a previous stage supported on Docker for Windows 17.09.0-ce-win33 (13620)? This is the Dockerfile:</p>
  
  <pre><code>FROM microsoft/dotnet:2.0-sdk AS build-env
  
  WORKDIR /app
  COPY ./ ./
  RUN dotnet build ProviderApi.csproj
  RUN dotnet publish ProviderApi.csproj -c Release -r linux-x64 -o out
  
  FROM microsoft/dotnet:2.0-runtime-deps
  WORKDIR /app
  COPY -–from=build-env /app/out/ ./
  EXPOSE 80
  ENTRYPOINT ["./ProviderApi"]
  </code></pre>