On 2001-07-13T16:55:57-0400, Ken Shan wrote:
Current hurdle: ghc-inplace doesn't seem to be finding its .hi files
for basic stuff.
puffin:~$ cat Main.hs
module Main where
import IO
main = putStrLn Hello, world!
puffin:~$
There's a test InstallShield for Windows of GHC 5.01 now available at
http://www.haskell.org/ghc/dist/5.00.2/ghc-5-01.exe
There is no link to this from the web pages, as it's not intended for
general consumption.
This is a thrill-seekers' release (hence the moniker). Please do try it out
and
If you have a type error message at the very start of a do statement, the result
can be rather confusing, because the typechecker doesn't know that do's are
almost always have type (IO (something)) and so tries to shoehorn the monad
to fit the type. This has actually happened to me several
Here's an example:
f x = do { c ; putStrLn x; return () }
Test.hs:3:
Couldn't match `[]' against `IO'
Expected type: [t]
Inferred type: IO ()
In the application `putStrLn x'
in a `do' expression pattern binding: putStrLn x
I don't see an easy way to improve
On 2001-07-16T09:48:46-0700, Simon Peyton-Jones wrote:
Here's an example:
f x = do { c ; putStrLn x; return () }
Would
asIO :: IO a - IO a
asIO = id
help here?
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