%external broken in v12.0.0-alpha.8

[dsiu]

This code from the official documentation doesn't compile in v12.0.0-alpha.8. It works find in alpha.7. I suppose it is due to the removal of Pervasives.\"="

switch %external(__DEV__) {
| Some(_) => Console.log("dev mode")
| None => Console.log("production mode")
}

Error:

Type Errors
[E] Line 1, column 7:
The value = can't be found in Pervasives

Playground link: here

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