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try:

```s3Bucket, err := s3.NewBucket(ctx, "demo", &amp;s3.BucketArgs{})
		iam.NewPolicy(ctx, "demo", &amp;iam.PolicyArgs{
			Policy: pulumi.Sprintf(`{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": "s3:GetObject",
            "Resource": %s
        }
    ]
}`, s3Bucket.Arn),```

I have tested it and it seems to be wrong,

```policy := pulumi.JSONMarshal(map[string]interface{}{
			"Id":      "demo-policy",
			"Version": "2012-10-17",
			"Statement": []interface{}{
				map[string]interface{}{
					"Sid": "Enable IAM User Permissions",
					"Principal": map[string]interface{}{
						"AWS": pulumi.Sprintf("arn:aws:iam::%s:root", current.AccountId),
					},
					"Action": "ec2:*",
					"Effect": "Allow",
				},
			},
		})```

```      "Principal": {
        "AWS": "arn:aws:iam::%!d(string=123123123131):root"
      },```

you’re trying to interpolate an int as a string. use %d instead

Typical of being obsessed with looking for the needle in the haystack.

I would highly suggest making use of iam.GetPolicyDocument instead of trying to format a string within your code.

Avoids having to do the JSONMarshal stuff as well

I am testing it and the truth is that although for the example that is in the documentation I see it well, for simple things, I see that it is complicated in excess for some cases. In most of the times, you have to be always checking if an error has occurred, but if you do it in the JSON Marshall way, it wasn’t necessary.

Generally speaking you should be handling your errors if you didn't want to maybe golang wasn't the right choice.