Re: [Haskell-cafe] Way to prevent a value from being garbage collected too early

The primitive is `touch#` (https://www.stackage.org/haddock/lts-15.12/base-4.13.0.0/GHC-Exts.html#v:tou...) It's quite fragile (e.g. can be optimized away or moved), so we're trying to replace it with something else. See https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/with-combinator On 13/05/2020 09:03, YueCompl via Haskell-Cafe wrote:

Thanks! I found `touch` in `Control.Monad.Primitive` , and repa even requires an array element type to implement `Elt` which mainly asking for the `touch` method.

It's interesting to know there's even more improvement on it.

...

On 2020-05-13, at 14:52, David Feuer mailto:david.feuer@gmail.com> wrote:

You're looking for the `touch` function. I don't remember where it lives. I believe there's also a new and improved replacement whose name I don't remember.

On Wed, May 13, 2020, 2:47 AM YueCompl via Haskell-Cafe mailto:haskell-cafe@haskell.org> wrote:

Folks,

I need a little help, I remember I had read some where that, there's a function to fake a use of a value, so it won't be garbage collected too early, as GHC has an optimization to forget a value as early as possible. But I can't remember the function name or even the keyword to google it out, hint me please!

Best regards, Compl

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