#11760: runST with lazy blackholing breaks referential transparency -------------------------------------+------------------------------------- Reporter: Yuras | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by duncan): Right, I was also going to say it'd have to be in `>>=`, not just `runST`. The type of `noDuplicate#` should be generalised to not limit it to `RealWorld`. Is this going to be horribly expensive? Do we need rules to merge duplicate `noDuplicate#`s? In IO it's clear when we pay this expense since we do it via unsafeInterleaveIO, but in lazy ST that just corresponds to "safe" bind. For now I'll add some `noDuplicate`s in the zlib binding. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11760#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler