Assuming `Clone::clone()` is equivalent to `Copy` semantics for all instances of `Copy`

briansmith · 2016-02-19T02:05:42.017Z

I think that is a bug in the optimizer. I commented such in https://github.com/rust-lang/rust/pull/31414. If rustc doesn’t optimize that kind of code then there are a lot of (functional) coding patterns that are going to be a disaster in terms of performance.

glaebhoerl · 2016-02-19T02:18:14.358Z

nikomatsakis:

Aren’t we talking about library code here? I was not saying that the optimizer would go and remove calls to clone.

Oh. For some reason I was interpreting the OP as the compiler magically doing it somehow. Doing it in library code seems less problematic.

system · 2019-03-25T08:25:45.744Z

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