message: Disable doctests in CI builds for old compiler versions.
diff: @@ -22,6 +22,13 @@ elif [ "$RUSTFMT" = "yes" ]; then
  cargo fmt --all -- --check
  else
  cargo build $BUILD_ARGS --release
  +
  + # TODO: Remove this hack once we no longer have to support 1.23 and 1.20
  + if [ "$TRAVIS_RUST_VERSION" = "stable" ]; then
  cargo test $BUILD_ARGS --all --release
  + else
  + cargo test $BUILD_ARGS --all --release --tests
  + fi
  +
  cargo bench $BUILD_ARGS --all -- --test
  fi
  