wip: check cache contents

.travis.yml

@@ -52,11 +52,13 @@ go_import_path: gonum.org/v1/gonum
 # Get deps, build, test, and ensure the code is gofmt'ed.
 # If we are building as gonum, then we have access to the coveralls api key, so we can run coverage as well.
 script:
+ - for f in $(ls $HOME/.cache/go-build); do echo $f; done
  - ${TRAVIS_BUILD_DIR}/.travis/check-copyright.sh
  - ${TRAVIS_BUILD_DIR}/.travis/check-formatting.sh
  - go get -d -t -v ./...
  - go build -v ./...
  - go test $TAGS -v ./...
+ - for f in $(ls $HOME/.cache/go-build); do echo $f; done
  - if [[ $TRAVIS_SECURE_ENV_VARS = "true" ]]; then bash ./.travis/test-coverage.sh; fi
  - ${TRAVIS_BUILD_DIR}/.travis/check-imports.sh
  # This is run last since it alters the tree.