message: Force overriding a symbolic link for Go testing,
  otherwise repeating calls of `bazel test go:test` fail.
diff: @@ -42,7 +42,7 @@ fi
  export GOPATH="${TEST_TMPDIR}/go"
  export GOCACHE="${TEST_TMPDIR}/cache"
  mkdir -p "${GOPATH}/src/github.com/tensorflow"
  -ln -s "${PWD}" "${GOPATH}/src/github.com/tensorflow/tensorflow"
  +ln -s -f "${PWD}" "${GOPATH}/src/github.com/tensorflow/tensorflow"
  # Ensure that the TensorFlow C library is accessible to the
  # linker at build and run time.
  