Haskell 中的模式匹配

Question

I am working on a Haskell project and I have some trouble with this code snippet:

buildTowers :: [Int] -> Int ->[[Bool]]
buildTowers [x] max = (buildBoolList x max) :[]
buildTowers (x:xs) max = (buildBoolList x max):buildTowers xs max

I get this error: Non exhausting pattern matches, but for me it seems as everthing is covered. Do you know what the problem is?

Thanks in advance.

Answer 1

As @Reid Barton already pointed out in the comments, you are missing to match the empty list. I'd further go with @Daniel Wagners suggestion, merging both in this community answer so the question can be closed.