On Tuesday 08 January 2013, 12:02:45, Brent Yorgey wrote:
Twan's analysis is correct. But wow, that's a horrible error message. Do you by any chance have the TemplateHaskell extension enabled (either with {-# LANGUAGE TemplateHaskell #-} at the top or your file, or with :set -XTemplateHaskell in a .ghci file, or anything like that)?
Must be: module Naked where start :: Int start = 13 start + 5 ====== $ ghci Naked GHCi, version 7.6.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. [1 of 1] Compiling Naked ( Naked.hs, interpreted ) Naked.hs:6:1: Parse error: naked expression at top level Failed, modules loaded: none. ====== $ ghci -XTemplateHaskell Naked GHCi, version 7.6.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. [1 of 1] Compiling Naked ( Naked.hs, interpreted ) Naked.hs:6:1: GHC stage restriction: `start' is used in a top-level splice or annotation, and must be imported, not defined locally In the first argument of `(+)', namely `start' In the expression: start + 5 Failed, modules loaded: none. The message without TH is clear and good.
If not this should really be filed as a bug, GHC has no business giving TH-related error messages without TH being turned on.
-Brent