let { matrix1 = (array ((1,1),(3,3)) [((1,1), 0.0), ((1,2), 0.0), ((1,3),-2.0), ((2,1), 0.0), ((2,2), 7.0), ((2,3), 0.0), ((3,1), 0), ((3,2), 0), ((3,3), -3)])} ;
The layout rule will otherwise add { } as follows:
do { let x = 10 ;
putStr "hello" ;
}
-->
do { let { x = 10 ; <empty decl> }
putStr "hello" ;
}
which is wrong, because there is no semicolon separating the 'let'-declaration from the 'putStr' expression.
A solution is to use layout instead of { ; } or write semicolons in front of declarations:
do { let x = 10
; putStr "hello"
}
This translates into:
do { let { x = 10 }
; putStr "hello"
}
The semicolon is not part of the 'let' declaration, because it is indented less than 'x' .
For more information, see: http://haskell.org/onlinereport/syntax-iso.html#layout
Hope this helps,
Arthur
On 17-mrt-05, at 20:42, Dmitri Pissarenko wrote:
Hello!
In the attachment you will find a file, in which I try to access Java from
Haskell using the Java bridge for functional languages.
For details see
http://sourceforge.net/projects/jvm-bridge/
and
http://dapissarenko.com/resources/2005_02_17_eigenvaluesJava/ 2005_02_17_eigenva
luesJava.pdf
When I try to compile the attached file using
ghc +RTS -c -RTS -package javavm -c EigenvalueCalculatorHaskell.hs -o EigenvalueCalculatorHaskell.o
I get the error
EigenvalueCalculatorHaskell.hs:28: parse error on input `putStrLn'
Unfortunately, I have not the slightest idea about how to fix/isolate it (I
already commented out almost the whole code).
Please tell me what I could try to correct the error. I appreciate ANY hint.
Many thanks in advance
Dmitri Pissarenko
PS: The source code of the files related to EigenvalueCalculatorHaskell.hs is
located at
http://dapissarenko.com/resources/2005_02_17_eigenvaluesJava/ 2005_02_17_lik.zip
--
Dmitri Pissarenko
Software Engineer
http://dapissarenko.com
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