There is a Haskell operator !?.
It is not possible to search for it.
Searching for Haskell !? just redirects to the search for Haskell.
Searching for Haskell "!?" results in a browser error "The page isn’t redirecting properly".
I would expect this to work when searching for "!?".
The result I would like to obtain is: https://hackage.haskell.org/package/containers-0.6.7/docs/Data-Map-Internal.html#v:!?
