úÎÒ     CAdd a tree tracing the successful parsers in the Parsec user state (c) Gregor Riegler, 2015MITgregor.riegler@gmail.com experimentalSafe479N e" is the value type of your parserss is the ! instance type of the tree valuesu is the Parsec user statem/ is the underlying monad of your Parsec parsersAn instance of  somehow refers to a ;Make your Parsec user state type an instance of this class.Get the  from the parser state t Modify the  stored in the parser state tPoints to a position in a tree The tree of the current position$The siblings of the current position#The parents of the current position EThe value that can be used on initialisation of the Parsec user state ’Default configuration which logs nothing on entering/exiting and ignores the parser values Manipulate this default configuration with setters as  or lenses as  Apply this function to your 1 to get a function which adds tracing to a parser k trace = traceWith (setTraceFunc show defaultTraceConfig) myparser = trace $ string "parseSomething" Use  to log a monadic value in the  as a leaf of the current parser 8How to produce a tree value given the result of a parser3Logging action that is run at the start of a parser3Logging action that is run at the end of the parser       !      !"#parse_4tZ7rNw7HdVJAHD3eaGFRMText.Parsec.Trace.Tree TraceConfig HasTraceTreegetTracemodTrace TraceTree setTraceFunc setLogEnter setLogExit _traceFunc _logEnter_logExitinitialTraceTreedefaultTraceConfig traceWith drawTraceTreedrawTraceTree' getTraceTreelogPbase Data.StringIsStringTreePoscontentsiblingsparents traceFunclogEnterlogExitinsertparentunTreerootmodifyT