Here's the output from -ddump-splices (thanks Saizan for the tip).
It's returning a1 instead of a0.
ghci -fth -e '$( _derive_print_instance makeFunParser '"''"'Foo )'
baz.hs -ddump-splices
baz.hs:1:0:
baz.hs:1:0: Splicing declarations
derive makeFunParser 'Foo
======>
baz.hs:30:3-28
instance {FunParser Main.Foo} where
[]
{ parse = choice
[(>>)
(reserved ['F', 'o', 'o'])
((>>)
(char '(') ((>>=) parse (\ a0 -> (>>)
(char ')') (return (Main.Foo a1)))))] }
baz.hs:30:3: Not in scope: `a1'
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