- Search for the [c++] tag with another (e.g. "[c++] [php]", though all tags fail when accompanied by c++)
- No results are shown. Likely for [c++][php], but not for [c][c++] which are known to have some.
- The question tags on the right show either "[c+++other]" or "[other] [c]  "
- The ++ part of [c++] should be properly recognized as being part of the tag