I got a programm in haskell outputting utf-8 using the package utf8-string and using only the output functions of this package.

I set the encoding of each file I write to this way :

hSetEncoding myFile utf8
{- myFile may be stdout -}

but when I try to output :

alpha = [fromEnum 0x03B1] {- a -}

instead of the nice alpha letter I got on Linux (or in a file on windows), I got the following :

α 

The weird thing is even if I try to write the output on a file, I can't read it back with mvim as an utf-8 file. Is there any way to get the correct behaviour