StrictData and the parser

[Adam Sandberg Eriksson]

Hello *,

I'm working on the -XStrict language extension[1] for this years Google
summer of code. I've started with the smaller -XStrictData (as
documented at the wiki) and have the internals mostly figured out.

However after adding relevant rules for '~' in the parser[2] I get an
explosion of shift/reduce conflicts as well as 4 extra reduce/reduce
conflicts, see [3] for the happy info (the states with 36 shift/reduce
conflicts seem to be the problematic ones), I also fail to parse the
test file [4] with the error

DsStrictData.hs:15:1: error:
    parse error (possibly incorrect indentation or mismatched brackets)

Can anyone offer some guidance on what the appropriate changes to the
parser are to make these "lazyness" marks work?

Thanks,
Adam

[1]: https://ghc.haskell.org/trac/ghc/wiki/StrictPragma
[2]:
https://github.com/adamse/ghc/blob/strict-pragma/compiler/parser/Parser.y#L1547-L1563
[3]:
https://gist.githubusercontent.com/adamse/8d6c54b6ae660fca8b97/raw/detailed-info
[4]:
https://github.com/adamse/ghc/blob/strict-pragma/testsuite/tests/deSugar/should_run/DsStrictData.hs#L13
-- 
Adam Sandberg Eriksson