id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
3454,ghci freezes on failed pattern match in recursive list comprehension,Syzygies,,"The following freezes ghci (top shows no resources consumed):

{{{
Prelude> let xs = [1..5] : [ xt | (_:xt) <- xs ] in take 7 xs
[[1,2,3,4,5],[2,3,4,5],[3,4,5],[4,5],[5],[]
}}}

This is not the same issue as [http://hackage.haskell.org/trac/ghc/ticket/3053] (closed, invalid) as there are no elements to filter. (This may be a well-known black hole, but not to me; I was hoping a similar list would just terminate, trying to avoid the Nothing case boilerplate in an unfoldl.)",bug,closed,normal,,Compiler,6.10.4,invalid,,,Unknown/Multiple,Unknown/Multiple,,Unknown,,,,