Error message "Expecting a function type, but found `w_a1Kh'"
When compiling with GHC or loading into GHCi the following module I get a strange error:
module Bla where bla :: String -> String bla x = unwords $ [ ('#':) ]
The error is:
Bug.hs:4:20: Expecting a function type, but found `w_a1bp' Expected type: String Inferred type: [Char] -> [Char] In the expression: ('#' :) In the list element: ('#' :)
Writing the function as:
bla = words [ ('#':) ]
produces the correct error message with [Char] instead of `w_a1bp'.
I was doing this with GHC-6.4.2 on Ubuntu with a 2.6.17 kernel.