> Did you try -fpedantic-bottoms?
I just tried. The exception (or seq?) is still optimized away.
Here is what I tried:
-- file Foo.hs
import Control.Exception
import Control.DeepSeq
main = evaluate (('a' : undefined) `deepseq` return () :: IO ())
$ ghc -fforce-recomp -fpedantic-bottoms -O Foo.hs && ./Foo && echo bar
[1 of 1] Compiling Main ( Foo.hs, Foo.o )
Linking Foo ...
bar
Cheers,
Simon
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