Also I set up the MatchFinder with the matcher and the MatchCallBack
I use this to match a given AST
I'd like to know if it is possible to use this matcher to match only inside a subtree and not on the whole AST. For example, if a have a given FunctionDecl node, I'd like to use the matcher to match only against nodes below this one. I've searched through the documentation and could not find anything to help me with this.