Remove msan test again.

Author: spacejam

.github/workflows/test.yml

@@ -155,27 +155,3 @@ jobs:
       run: |
         set -eo pipefail
         scripts/sanitizers.sh
-  msan_tree_tests:
-    name: MSAN doc tests
-    env:
-      RUST_BACKTRACE: 1
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - name: Cache rustup
-      uses: actions/cache@v2
-      env:
-        cache-name: cache-msan-tree-target-and-lockfile
-      with:
-        path: |
-          ~/.rustup
-          target
-          Cargo.lock
-        key: ${{ runner.os }}-${{ env.cache-name }}-${{ hashFiles('**/Cargo.toml') }}
-    - name: sanitizers
-      run: |
-        rustup toolchain install nightly
-        rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
-        export RUSTFLAGS="-Zsanitizer=memory -Zsanitizer-memory-track-origins"
-        export MSAN_OPTIONS=verbosity=2
-        cargo +nightly test --doc -Zbuild-std --target x86_64-unknown-linux-gnu --features=light_testing -- --nocapture --test-threads=1