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Editorial Team
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Asked: 2026-05-28T04:25:26+00:00

I attached the code, with indentation, anyone know where is the problem? Error code:

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Indentation problem

I attached the code, with indentation, anyone know where is the problem?

Error code:

zo.hs:7:9: parse error (possibly incorrect indentation)
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1 Answer

  1. Editorial Team

    The line 

    [...] = show x ++   ++ show [...]

    contains several syntax errors. In particular, (++) is a binary operator, not something to surround your show foo with.

    Try

    [...] = show x ++ show treeB ++ show treeJ

    Also,

    show Leaf

    is not defined:

    show Leaf = "Leaf"
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