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

[YueCompl]

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 <david.feuer at 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 <haskell-cafe at haskell.org <mailto:haskell-cafe at 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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