GHC does not warn for mistakenly empty case
{-# LANGUAGE EmptyCase #-}
{-# OPTIONS_GHC -Wall -fwarn-incomplete-uni-patterns #-}
oops :: Int -> a
oops x = case x of {}
Since Int
is inhabited, I would expect a warning, but I get none. Since empty case is typically used in situations where programmers want GHC to see an absurdity, this seems most unfortunate.
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
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Architecture |