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3822650e15
There is some existing practice in the "terraform" package of returning a special error type ValidationError from EvalNode implementations in order to return warnings without halting the graph walk even though a non-nil error was returned. This is a diagnostics-flavored version of that approach, allowing us to avoid totally reworking the EvalNode concept around diagnostics and retaining the ability to return non-fatal errors. NonFatalErr is equivalent to the former terraform.ValidationError, while ErrWithWarnings is a helper that automatically treats any errors as fatal but returns NonFatalError if the diagnostics contains only warnings.