haskell - Make Text.Parsec.Indent parsing fail if unindent does not match any outer indentation level -

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I am trying to parse a string in Haskell which represents a tree. Each node is on one line, where indentation determines nesting (eg Python or Haskell's syntax).

The result of "tree" "tree" "tree" Tree "F" []]]

And with the help of that, I could parse such an example.

The problem is that my current implementation successfully parses the string 

  as ABCD

< The tree "d" [tree "one" [tree "B" [tree "C"]], tree "D" []]

node D D is unrelated to C , but it does not match indentation level of A Or b .

My implementation is as follows (Simplification: tree labels are ineligible and are alphanumeric characters, not all types of Unicode newline supported). 

  Import the Eligible Control. Apply as an importable control. M Monad as importable text. Import imported text as P import. Persec.Indent As I Pars :: String - & gt; Either p. Parasier [tree] pars = IrunIndent "". P. Runeparcer forest () "forest" = p. Mama tree A and LT; * PF tree = spacing a. * & Gt; I.withBlock Tree Node Tree Vacancy = PMM P.Newline A. * & Gt; Indented indentation = PMAAA $ P.Ker "node = label A and LT; * Spacing label = p. MAI1p. LFANM A & LT; * Lineand Lineind = M. Owed P. Anviline p. & Lt; | & Gt; P.E.f

How can this parser be changed to accept Assentments, which matches some external indentation level? thank you in advanced.

instead of the definition of one > 

  forest = I.block tree A & lt; * P.eof

seems to do the trick. I.block here ensures that the roots of the source string are indented at the same level.

Example 

  ABCD  
 now with  
  (line 4, column 7) failed Lives: The problem with unexpected 'D' or end of input does not match indent or indentation. The problem with  
 
  P.many tree  is that one  trees  can be indented arbitrarily, as soon as any of the  trees  is any indentation level (eg  D ) Does not match, parser one Top-tier number two  increases the tree  (root)  forest  instead of fail.

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