Template Haskell only accepts semicolons not newlines in data declaration quotations

[greenrd@…]

GHC 6.6 rejects a declaration quotation (i.e. [|d ... |]) containing multiple lines, but it accepts it if you change all newlines to semicolons. The latter makes code harder to read.

[igloo]

You can certainly say something like this:

import Language.Haskell.TH

$( do ds <- [d|
                foo = 'a'
                bar = 'b'
              |]
      runIO $ putStrLn $ pprint ds
      return ds
 )

Have you got an example that doesn't work how you'd expect?

[greenrd]

Woops, I knew I should have attached a test case.

$(id [d|data Foo
data Bar |] )

[igloo]

That code has incorrect layout. Similarly, with plain old Haskell,

    data Foo
data Bar

would be rejected. All the declarations need to be aligned (or use explicit braces and semi-colons, as you said).

Thanks

Ian