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I don't think it's been integrated in any mainstream language though.
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https://ghc.gitlab.haskell.org/ghc/doc/users_guide/exts/line...

Experimental and of course one can debate whether Haskell is mainstream but I figured it merits a mention.

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I think by default Rust uses affine types, but that's about the extent of it.
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I know some research languages are playing around with linear types, I wonder if we'll see it show up in some language or another.
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