diff --git a/examples/simple/cue.mod/pkg/dagger.cloud/alpine/alpine.cue b/examples/simple/cue.mod/pkg/dagger.cloud/alpine/alpine.cue
deleted file mode 100644
index 6544e81f..00000000
--- a/examples/simple/cue.mod/pkg/dagger.cloud/alpine/alpine.cue
+++ /dev/null
@@ -1,50 +0,0 @@
-package alpine
-
-// Default version pinned to digest. Manually updated.
-let defaultDigest="sha256:3c7497bf0c7af93428242d6176e8f7905f2201d8fc5861f45be7a346b5f23436"
-
-ref: string 
-
-// Match a combination of inputs 'version' and 'digest':
-*{
-	// no version, no digest:
-	ref: "index.docker.io/alpine@\(defaultDigest)"
-} | {
-	// version, no digest
-	version: string
-	ref: "alpine:\(version)"
-} | {
-	// digest, no version
-	digest: string
-	ref: "alpine@\(digest)"
-} | {
-	// version and digest
-	version: string
-	digest: string
-	ref: "alpine:\(version)@\(digest)"
-}
-
-// Packages to install
-package: [string]: true | false | string
-
-#dagger: compute: [
-	{
-		do: "fetch-container"
-		"ref": ref
-	},
-	for pkg, info in package {
-		if (info & true) != _|_ {
-			do: "exec"
-			args: ["apk", "add", "-U", "--no-cache", pkg]
-			// https://github.com/blocklayerhq/dagger/issues/6
-			mount: foo: {}
-		}
-		if (info & string) != _|_  {
-			do: "exec"
-			args: ["apk", "add", "-U", "--no-cache", "\(pkg)\(info)"]
-			// https://github.com/blocklayerhq/dagger/issues/6
-			mount: foo: {}
-		}
-	},
-]
-
diff --git a/examples/simple/cue.mod/pkg/dagger.cloud/dagger/dagger.cue b/examples/simple/cue.mod/pkg/dagger.cloud/dagger/dagger.cue
index 407d9127..6d315bb0 100644
--- a/examples/simple/cue.mod/pkg/dagger.cloud/dagger/dagger.cue
+++ b/examples/simple/cue.mod/pkg/dagger.cloud/dagger/dagger.cue
@@ -51,7 +51,9 @@ package dagger
 
 // Any component can be referenced as a directory, since
 // every dagger script outputs a filesystem state (aka a directory)
-#Dir: #Component
+#Dir: #Component & {
+	#dagger: compute: _
+}
 
 #Script: [...#Op]
 
@@ -67,8 +69,8 @@ package dagger
 }
 
 #Local: {
-	do:       "local"
-	dir:      string
+	do:      "local"
+	dir:     string
 	include: [...string] | *[]
 }
 
@@ -92,11 +94,11 @@ package dagger
 #MountCache: "cache"
 #MountComponent: {
 	from: #Component
-	path:  string | *"/"
+	path: string | *"/"
 }
 #MountScript: {
 	from: #Script
-	path:  string | *"/"
+	path: string | *"/"
 }
 
 #FetchContainer: {
diff --git a/examples/simple/simple.cue b/examples/simple/simple.cue
index e096eb13..728a0ed3 100644
--- a/examples/simple/simple.cue
+++ b/examples/simple/simple.cue
@@ -3,23 +3,33 @@
 package acme
 
 import (
-	"dagger.cloud/alpine"
 	"dagger.cloud/dagger"
 )
 
-let base=alpine & {
-	package: {
-		bash: ">3.0"
-		rsync: true
-	}
+let alpine={
+	digest: "sha256:3c7497bf0c7af93428242d6176e8f7905f2201d8fc5861f45be7a346b5f23436"
+	package: [string]: true | false | string
+	#dagger: compute: [
+		{
+			do: "fetch-container"
+			ref: "index.docker.io@\(digest)"
+		},
+		for pkg, info in package {
+			if (info & true) != _|_ {
+				do: "exec"
+				args: ["apk", "add", "-U", "--no-cache", pkg]
+			}
+			if (info & string) != _|_  {
+				do: "exec"
+				args: ["apk", "add", "-U", "--no-cache", "\(pkg)\(info)"]
+			}
+		},
+	]
 }
 
 www: {
 
-	source: {
-		// Make this undefined on purpose to require an input directory.
-		#dagger: compute: _
-	}
+	source: dagger.#Dir
 
 	// List the contents of the source directory
 	listing: {
@@ -27,7 +37,7 @@ www: {
 
 		#dagger: compute: [
 			dagger.#Load & {
-				from: base
+				from: alpine
 			},
 			dagger.#Exec & {
 				args: ["sh", "-c", "ls /src > /tmp/out"]
@@ -47,7 +57,10 @@ www: {
 		string
 
 		#dagger: compute: [
-			dagger.#Load & { from: base },
+			{
+				do: "load"
+				from: alpine
+			},
 			dagger.#Exec & {
 				args: ["sh", "-c", "echo -n 'https://\(host)/foo' > /tmp/out"]
 			},