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Re:Upcoming/proposed breaking changes to Haskell by knome on Wednesday November 17, 2021 @09:04AM (#29253068)
>Nit: Adding a keyword is not a breaking change, removing them is.

Of course adding a keyword is a breaking change. It will invalidate all uses of that keyword where used as a variable. Perhaps PHP is unaffected, as it has sigils on its variables, but most languages, including haskell, do not.

Re:Upcoming/proposed breaking changes to Haskell by masklinn on Wednesday November 17, 2021 @10:38AM (#29254473)
> Perhaps PHP is unaffected, as it has sigils on its variables

Locals are prefixed but functions, constants, and classes are not.

Also barewords but that horror was removed in php 8.