[Haskell-cafe] GHC TV station?
neil_mayhew at users.sourceforge.net
Tue May 15 16:56:34 UTC 2018
On 2018-05-15 10:13 AM, Sylvester via Haskell-Cafe wrote:
> strlen in Hutton 2ed 10.5 Derived primitives => run on Windows 7 Haskell
> Platform 8.2.2
> strlen :: IO ()
> strlen = do putStr "Enter a string: "
> xs <- getLine
> putStr "The string has "
> putStr (show (length xs))
> putStr " characters"
This works fine if you indent the code correctly. The code following the
first putStr should line up with it vertically:
strlen :: IO ()
strlen = do putStr "Enter a string: "
xs <- getLine
putStr "The string has "
putStr (show (length xs))
putStr " characters"
This compiles for me with ghc 8.2.
The way you have the code above, the second and subsequent lines of the
do block are indented further, and so would need an additional do.
However, I don't think this is what's intended.
Are you using tabs by any chance? Or have you copied the source from
text that uses a mixture of tabs and spaces?
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