Make new lexer work on GHC 7.8.
Make new lexer work on GHC 7.8.

mrakgr/futhark,mrakgr/futhark,mrakgr/futhark,ihc/futhark,ihc/futhark,diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,HIPERFIT/futhark,ihc/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,CulpaBS/wbBach