message: try using current rust nightly for wasi tests
diff: @@ -314,13 +314,14 @@ jobs:
  tar xf clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz
  rustup toolchain install nightly
  rustup target add wasm32-wasi --toolchain nightly
  + - run: |
  + make test-wasi-singlepass
  + make test-wasi-clif
  - run: rustup default nightly-2019-04-11
  - run: |
  export LLVM_SYS_70_PREFIX="`pwd`/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/"
  make test
  make test-singlepass
  - make test-wasi-singlepass
  - make test-wasi-clif
  make test-emscripten-clif
  make test-emscripten-singlepass
  - save_cache:
  