On 29/09/2006, at 12:44 PM, Donald Bruce Stewart wrote:


Alternatively, use -fglasgow-exts :)

instance Foo String where
    mkFoo = id

$ ghci -fglasgow-exts A.hs
*Main> mkFoo "foo"
"foo"


And just to follow up what Don said, this feature of GHC is described here:

http://www.haskell.org/ghc/docs/latest/html/users_guide/type- extensions.html
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