#12620: Allow the user to prevent floating and CSE -------------------------------------+------------------------------------- Reporter: nomeata | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #9520, #8457 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): I think that "noupdate" would require some careful thought. What if I say {{{ f x = if ... then Yield blah x else ... }}} Then the "noupdate" second field of `Yield` is just the parameter to `f`. Does the caller have to know not to build an updatable thunk. And why is updating so bad? (Confession: I have not yet read Edsko's post. But I it should be possible to give a crisp explanation of what any language feature does in a standalone way.) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12620#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler