Haskell syntax error?

Question

I cant compile this part of code:

game a = let 
             gameBoard ++ a
             black = test a colors
             white = (test2 a colors) - black
             createScore black white
         in 
             merge gameBoard score

geting: Syntax error in declaration (unexpected `}', possibly due to bad layout)

Thanks for help.

This might help:stackoverflow.com/questions/11674892/whats-with-the-in-keyword — shree.pat18
– shree.pat18, Commented May 3, 2014 at 7:29
@JonathonReinhart } shows up unexpectedly (and not very newbie-friendly) in error messages because indentation blocks in Haskell are nominally syntactic sugar for explicit {;}s. It really means that an indentation block ended before it was complete. — Ørjan Johansen
– Ørjan Johansen, Commented May 3, 2014 at 19:09

AndrewC · Accepted Answer · 2014-05-03 07:55:11Z

1

The in is part of the same let statement, so has to be on the same line or further indented, for example

game a = let 
             gameBoard ++ a
             black = test a colors
             white = (test2 a colors) - black
             createScore black white
               in 
                 merge gameBoard score

Haskell's layout rule for syntax is roughly that if it's further in it's the same line, if it's lined up it's a new line within a block, and if it's outdented it's the end of a block, which is why your in generated a close brace.

answered May 3, 2014 at 7:55

AndrewC

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