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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #7411

Exceptions are optimized away in certain situations

The issue came up in this thread on glasgow-haskell-users.

Steps to reproduce:

-- file Foo.hs
import Control.Exception
import Control.DeepSeq
main = evaluate (('a' : undefined) `deepseq` return () :: IO ())
$ ghc -fforce-recomp -fpedantic-bottoms -O Foo.hs

Expected result:

The program should fail with:

Foo: Prelude.undefined

Actual result:

The program succeeds.

Compiling the program with -fno-state-hack helps.

Edited Mar 10, 2019 by Ben Gamari
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