#5572: factorial.hs:3:12: Parse error in pattern: n + 1
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Reporter: francisco | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: GHCi | Version: 7.0.3
Resolution: invalid | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Linux
Blocking: | Architecture: x86
Failure: GHCi crash |
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Comment(by francisco):
In GHCi 6.10.4 the dialog is:
$ factorial (-1)
*** Exception ... : Non-exhaustive patterns in function factorial
since n+1 only unify (in the past!) with a number equal or greater than 1,
so the risk of to fall into an infinite loop is avoided. So we changed a
possible infinite loop by an exception.
Anyway, please, how can I use "-XNPlusKPatterns". I do not know how to do
this.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5572#comment:3>
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