generating configuration is not allowed with the remote backend

internal/backend/remote/backend_plan.go

@@ -69,6 +69,15 @@ func (b *Remote) opPlan(stopCtx, cancelCtx context.Context, op *backend.Operatio
 		))
 	}
 
+	if op.GenerateConfigOut != "" {
+		diags = diags.Append(tfdiags.Sourceless(
+			tfdiags.Error,
+			"Generating configuration is not currently supported",
+			`The "remote" backend does not currently support generating resource configuration `+
+				`as part of a plan.`,
+		))
+	}
+
 	if b.hasExplicitVariableValues(op) {
 		diags = diags.Append(tfdiags.Sourceless(
 			tfdiags.Error,

internal/backend/remote/backend_plan_test.go

@@ -1248,3 +1248,33 @@ func TestRemote_planOtherError(t *testing.T) {
 		t.Fatalf("expected error message, got: %s", err.Error())
 	}
 }
+
+func TestRemote_planWithGenConfigOut(t *testing.T) {
+	b, bCleanup := testBackendDefault(t)
+	defer bCleanup()
+
+	op, configCleanup, done := testOperationPlan(t, "./testdata/plan")
+	defer configCleanup()
+
+	op.GenerateConfigOut = "generated.tf"
+	op.Workspace = backend.DefaultStateName
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+
+	<-run.Done()
+	output := done(t)
+	if run.Result == backend.OperationSuccess {
+		t.Fatal("expected plan operation to fail")
+	}
+	if !run.PlanEmpty {
+		t.Fatalf("expected plan to be empty")
+	}
+
+	errOutput := output.Stderr()
+	if !strings.Contains(errOutput, "Generating configuration is not currently supported") {
+		t.Fatalf("expected error about config generation, got: %v", errOutput)
+	}
+}