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[Source Code]
data FooBar = Foo | Bar
[Command]
$ ghc -c foo_bar.hs
foo_bar.hs:1:0: The function ‘main’ is not defined in module ‘Main’
[Configuration]
Glasgow Haskell Compiler, Version 6.12.3, for Haskell 98, stage 2 booted by GHC
version 6.10.4
You should define your type in a module, and then compile it:
By invoking
ghc -c foo_bar.hs, the object filefoo_bar.owill be generated without having to definemain.