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<@U0269KPHMR8> I believe you can have an applier function that returns an error:

<https://pkg.go.dev/github.com/pulumi/pulumi/sdk@v1.14.1/go/pulumi#OutputState.ApplyT>

You can also see in the code that an Output (e.g. StringOutput) will internally store whether it is rejected/errored:

<https://github.com/pulumi/pulumi/blob/sdk/v3.6.1/sdk/go/pulumi/types.go#L77>