add Data.Position: internalIdentAt
add Data.Position: internalIdentAt

I've just ported c2hs to use language.c, and this turned out to be useful.

darcs-hash:20080813092554-c1f02-e2f651132e4af614648f0c5f7de239a8a357f219

llelf/language-c,llelf/language-c,llelf/language-c