Parse error with LANGUAGE pragma

[ndmitchell]

Given:

{-# LANGUAGE
RecordWildCards
 #-}
main = print "hello"

This works in GHC, but raises a parse error in HSE. Note that #-} line is indented by one space - that's important or it's a parse error in GHC too. Originally from ndmitchell/hlint#125

[mpickering]

This is the same as #228

The lexer injects a semi colon before RecordWildCards as it is in the same column as the {-# above.

[pjonsson]

I don't think it's the same problem. The lexer should insert a semicolon in this case but our parser doesn't expect to find a semicolon in the middle of a language pragma. GHC has something similar in the grammar for deprecations to this:

> conids    :: { ([Name L],[S]) }
>          : conids ',' conid                  { (fst $1 ++ [$3], snd $1 ++ [$2]) }
>          | optsemis conid                    { ([$2],[]) }

[pjonsson]

Fixed with 52d1967.