Testing going back to the old toolchain. (#175)

Author: pschuh

Dockerfile

@@ -3,7 +3,7 @@
 FROM nvidia/cuda:10.0-cudnn7-devel-ubuntu18.04
 
 # Allows the caller to specify the toolchain to use.
-ARG swift_tf_url=https://storage.googleapis.com/s4tf-kokoro-artifact-testing/latest/swift-tensorflow-DEVELOPMENT-cuda10.0-cudnn7-test-ubuntu18.04.tar.gz
+ARG swift_tf_url=https://storage.googleapis.com/s4tf-kokoro-artifact-testing/latest/swift-tensorflow-DEVELOPMENT-cuda10.0-cudnn7-ubuntu18.04.tar.gz
 
 # Install Swift deps.
 ENV DEBIAN_FRONTEND=noninteractive
@@ -36,5 +36,8 @@ COPY . .
 RUN echo "/usr/local/cuda-10.0/targets/x86_64-linux/lib/stubs" > /etc/ld.so.conf.d/cuda-10.0-stubs.conf && \
     ldconfig
 
+# Print out swift version for better debugging for toolchain problems
+RUN /swift-tensorflow-toolchain/usr/bin/swift --version
+
 # Run SwiftPM tests
 RUN /swift-tensorflow-toolchain/usr/bin/swift test