This example seems to be wrong.

package main

import (
	"fmt"

	"<http://github.com/pulumi/pulumi-aws/sdk/v5/go/aws/rds|github.com/pulumi/pulumi-aws/sdk/v5/go/aws/rds>"
	"<http://github.com/pulumi/pulumi/sdk/v3/go/pulumi|github.com/pulumi/pulumi/sdk/v3/go/pulumi>"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := rds.NewCluster(ctx, "default", &rds.ClusterArgs{
			ClusterIdentifier: pulumi.String("aurora-cluster-demo"),
			AvailabilityZones: pulumi.StringArray{
				pulumi.String("us-west-2a"),
				pulumi.String("us-west-2b"),
				pulumi.String("us-west-2c"),
			},
			DatabaseName:   pulumi.String("mydb"),
			MasterUsername: pulumi.String("foo"),
			MasterPassword: pulumi.String("barbut8chars"),
		})
		if err != nil {
			return err
		}
		var clusterInstances []*rds.ClusterInstance
		for key0, val0 := range 2 {
			__res, err := rds.NewClusterInstance(ctx, fmt.Sprintf("clusterInstances-%v", key0), &rds.ClusterInstanceArgs{
				Identifier:        pulumi.String(fmt.Sprintf("aurora-cluster-demo-%v", val0)),
				ClusterIdentifier: _default.ID(),
				InstanceClass:     pulumi.String("db.r4.large"),
				Engine:            _default.Engine,
				EngineVersion:     _default.EngineVersion,
			})
			if err != nil {
				return err
			}
			clusterInstances = append(clusterInstances, __res)
		}
		return nil
	})
}

Specifically the ranging when creating the clusterInstances

(for key0, val0 := range 2)

. Range does not work like in Python. In go that range 2 will throw an error becasue first is an untyped int and second thats not how range works.

these examples are autogenerated, so entirely possible it’s wrong

Ok, thanks. How are they autogenerated? which tool is used if you dont mind me asking.

they are extracted from the terraform examples using pulumi terraform bridge

@flaky-arm-38472 I filed a bug for this. Feel free to upvote or comment: https://github.com/pulumi/pulumi-terraform-bridge/issues/593