Why is `@_predatesConcurrency` not compiling?

i’m getting

error: '@_predatesConcurrency' attribute cannot be applied to this declaration
@_predatesConcurrency import NIO

how do i get this to compile?

The PR that enabled it was merged only 2 days ago, and there hasn't been a new toolchain built after it yet.

Just because it is implemented (with an underscore) doesn’t mean it actually works.

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