Provide more information when function fails.
Provide more information when function fails.

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