disable doc tests when crossing

ci/script.sh

@@ -2,5 +2,23 @@
 
 set -ex
 
+case "$TRAVIS_OS_NAME" in
+  linux)
+    host=x86_64-unknown-linux-gnu
+    ;;
+  osx)
+    host=x86_64-apple-darwin
+    ;;
+esac
+
+# NOTE Workaround for rust-lang/rust#31907 - disable doc tests when crossing
+if [ "$host" != "$TARGET" ]; then
+  if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+    brew install gnu-sed --default-names
+  fi
+
+  find src -name '*.rs' -type f | xargs sed -i -e 's:\(//.\s*```\):\1 ignore,:g'
+fi
+
 cargo build --target $TARGET --verbose
 cargo test --target $TARGET --verbose