Compiling runtimeerrors/PatBind2.hs
(7,1): Warning: Missing patterns in pattern binding: 
  _ : (_ : _) = ...
  [] = ...
Compilation successful with 1 warning
exception: pattern match failed at pattern binding ranging from (7,1) to (7,19) in module runtimeerrors/PatBind2.hs.

trace:
  demanded from "LvmLang.<"
  demanded from "HeliumLang.showInt"
  demanded from "HeliumLang.$primPutChars"
  demanded from "LvmLang.bindIO"
  demanded from "LvmLang.unsafePerformIO"