Error diagnostics are not surfaced in the CLI when default is used for non-computed attribute

[bendbennett]

Module version

github.com/hashicorp/terraform-plugin-framework v1.3.2

Relevant provider source code

The attr_settings attribute has been incorrectly defined as it is using a Default, but it has not been specified as Computed.

func (r *exampleResource) Schema(ctx context.Context, request resource.SchemaRequest, resp *resource.SchemaResponse) {
	resp.Schema = schema.Schema{
		Attributes: map[string]schema.Attribute{
			"attr_settings": schema.BoolAttribute{
				Optional: true,
				Default:  booldefault.StaticBool(true),
			},
			"id": schema.StringAttribute{
				Computed: true,
				PlanModifiers: []planmodifier.String{
					stringplanmodifier.UseStateForUnknown(),
				},
			},
		},
	}
}

Terraform Configuration Files

resource "playground_example" "example" {
}

Debug Output

https://gist.github.com/bendbennett/8df62591b5f7d83a3b60ba2414b7cc26

The lines of interest are:

2023-07-12T14:21:44.225+0100 [TRACE] provider.terraform-provider-playground: Getting provider schema: tf_mux_provider=*schema.GRPCProviderServer tf_req_id=9ac1ac91-3f8a-68a7-0919-7bc2d9ea80de tf_rpc=GetProviderSchema @caller=/Users/bdb/go/pkg/mod/github.com/hashicorp/terraform-plugin-sdk/v2@v2.26.1/helper/schema/grpc_provider.go:70 @module=sdk.helper_schema tf_provider_addr=registry.terraform.io/bendbennett/playground timestamp=2023-07-12T14:21:44.225+0100
2023-07-12T14:21:44.225+0100 [TRACE] provider.terraform-provider-playground: Received downstream response: tf_provider_addr=registry.terraform.io/bendbennett/playground tf_rpc=GetProviderSchema @module=sdk.proto diagnostic_warning_count=0 tf_proto_version=5.3 tf_req_duration_ms=1 tf_req_id=9ac1ac91-3f8a-68a7-0919-7bc2d9ea80de @caller=/Users/bdb/go/pkg/mod/github.com/hashicorp/terraform-plugin-go@v0.17.0/tfprotov5/internal/tf5serverlogging/downstream_request.go:40 diagnostic_error_count=0 timestamp=2023-07-12T14:21:44.225+0100

Specifically, diagnostic_error_count=0 .

Running a debugger, it can be seen that the relevant diagnostic is added in (*Server).ResourceSchemas().

Expected Behavior

CLI surfaces diagnostic relating to a default being using on an attribute that is not computed:

Schema Using Attribute Default For Non-Computed Attribute

Actual Behavior

The CLI displays the following message:

│ Error: Invalid resource type
│ 
│   on resource.tf line 9, in resource "playground_example" "example":
│    9: resource "playground_example" "example" {

Steps to Reproduce

• Define a default on a non-computed attribute
• Run terraform apply

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