Prepare 0.28.2 release

The relative path should be based off the module name prefix, not the
package name.

.circleci/config.pkl

@@ -14,7 +14,7 @@
 // limitations under the License.
 //===----------------------------------------------------------------------===// 
 // File gets rendered to .circleci/config.yml via git hook.
-amends "package://pkg.pkl-lang.org/pkl-project-commons/pkl.impl.circleci@1.1.1#/PklCI.pkl"
+amends "package://pkg.pkl-lang.org/pkl-project-commons/pkl.impl.circleci@1.2.0#/PklCI.pkl"
 
 import "jobs/BuildNativeJob.pkl"
 import "jobs/GradleCheckJob.pkl"
@@ -148,6 +148,8 @@ jobs {
         command = #"""
           # exclude build_artifacts.txt from publish
           rm -f pkl-cli/build/executable/*.build_artifacts.txt
+          find pkl-cli/build/executable/* -type d | xargs rm -rf
+          rm -f pkl-cli/build/executable/resources
           gh release create "${CIRCLE_TAG}" \
             --title "${CIRCLE_TAG}" \
             --target "${CIRCLE_SHA1}" \

.circleci/config.yml

@@ -34,7 +34,7 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: macos.m1.large.gen1
+    resource_class: m2pro.large
     macos:
       xcode: 15.3.0
   pkl-cli-linux-amd64-release:
@@ -142,7 +142,7 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: macos.m1.large.gen1
+    resource_class: m2pro.large
     macos:
       xcode: 15.3.0
   pkl-cli-linux-aarch64-release:
@@ -347,7 +347,7 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: macos.m1.large.gen1
+    resource_class: m2pro.large
     macos:
       xcode: 15.3.0
   pkl-cli-linux-amd64-snapshot:
@@ -455,7 +455,7 @@ jobs:
     environment:
       LANG: en_US.UTF-8
       JAVA_HOME: /Users/distiller/jdk/Contents/Home
-    resource_class: macos.m1.large.gen1
+    resource_class: m2pro.large
     macos:
       xcode: 15.3.0
   pkl-cli-linux-aarch64-snapshot:
@@ -735,6 +735,8 @@ jobs:
         command: |-
           # exclude build_artifacts.txt from publish
           rm -f pkl-cli/build/executable/*.build_artifacts.txt
+          find pkl-cli/build/executable/* -type d | xargs rm -rf
+          rm -f pkl-cli/build/executable/resources
           gh release create "${CIRCLE_TAG}" \
             --title "${CIRCLE_TAG}" \
             --target "${CIRCLE_SHA1}" \

.circleci/jobs/BuildNativeJob.pkl

@@ -16,7 +16,7 @@
 /// Builds the native `pkl` CLI
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.1.2#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
 
 /// The architecture to use
 arch: "amd64"|"aarch64"
@@ -158,7 +158,7 @@ job {
     macos {
       xcode = "15.3.0"
     }
-    resource_class = "macos.m1.large.gen1"
+    resource_class = "m2pro.large"
     environment {
       ["JAVA_HOME"] = "/Users/distiller/jdk/Contents/Home"
     }

.circleci/jobs/DeployJob.pkl

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.1.2#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
 
 local self = this
 

.circleci/jobs/GradleCheckJob.pkl

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.1.2#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
 
 steps {
   new Config.RunStep {

.circleci/jobs/GradleJob.pkl

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 abstract module GradleJob
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.1.2#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
 import "package://pkg.pkl-lang.org/pkl-pantry/pkl.experimental.uri@1.0.3#/URI.pkl"
 
 /// Whether this is a release build or not.

.circleci/jobs/SimpleGradleJob.pkl

@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 extends "GradleJob.pkl"
 
-import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.1.2#/Config.pkl"
+import "package://pkg.pkl-lang.org/pkl-pantry/com.circleci.v2@1.5.0#/Config.pkl"
 
 name: String = command
 

buildSrc/src/main/kotlin/pklFatJar.gradle.kts

@@ -42,20 +42,20 @@ val relocations =
     "org.organicdesign.fp." to "org.pkl.thirdparty.paguro.",
     "org.snakeyaml.engine." to "org.pkl.thirdparty.snakeyaml.engine.",
     "org.msgpack." to "org.pkl.thirdparty.msgpack.",
-    "org.w3c.dom." to "org.pkl.thirdparty.w3c.dom",
+    "org.w3c.dom." to "org.pkl.thirdparty.w3c.dom.",
     "com.oracle.svm.core." to "org.pkl.thirdparty.svm.",
 
     // pkl-cli dependencies
     "org.jline." to "org.pkl.thirdparty.jline.",
     "com.github.ajalt.clikt." to "org.pkl.thirdparty.clikt.",
-    "com.github.ajalt.colormath" to "org.pkl.thirdparty.colormath.",
+    "com.github.ajalt.colormath." to "org.pkl.thirdparty.colormath.",
-    "com.github.ajalt.mordant" to "org.pkl.thirdparty.mordant",
+    "com.github.ajalt.mordant." to "org.pkl.thirdparty.mordant.",
-    "com.sun.jna" to "org.pkl.thirdparty.jna",
+    "com.sun.jna." to "org.pkl.thirdparty.jna.",
     "kotlin." to "org.pkl.thirdparty.kotlin.",
     "kotlinx." to "org.pkl.thirdparty.kotlinx.",
     "org.intellij." to "org.pkl.thirdparty.intellij.",
-    "org.fusesource.jansi." to "org.pkl.thirdparty.jansi",
+    "org.fusesource.jansi." to "org.pkl.thirdparty.jansi.",
-    "org.fusesource.hawtjni." to "org.pkl.thirdparty.hawtjni",
+    "org.fusesource.hawtjni." to "org.pkl.thirdparty.hawtjni.",
 
     // pkl-doc dependencies
     "org.commonmark." to "org.pkl.thirdparty.commonmark.",
@@ -71,6 +71,19 @@ val relocations =
     "com.squareup.kotlinpoet." to "org.pkl.thirdparty.kotlinpoet.",
   )
 
+for ((key, value) in relocations) {
+  if (!key.endsWith(".")) {
+    throw GradleException(
+      "Invalid relocation `\"$key\" to \"$value\"`: `$key` should end with a dot"
+    )
+  }
+  if (!value.endsWith(".")) {
+    throw GradleException(
+      "Invalid relocation `\"$key\" to \"$value\"`: `$value` should end with a dot"
+    )
+  }
+}
+
 val nonRelocations = listOf("com/oracle/truffle/", "org/graalvm/")
 
 tasks.shadowJar {

docs/antora.yml

@@ -1,6 +1,6 @@
 name: main
 title: Main Project
-version: 0.28.0-dev
+version: 0.28.2
-prerelease: true
+prerelease: false
 nav:
 - nav.adoc

docs/modules/ROOT/pages/evolution-and-roadmap.adoc

@@ -7,7 +7,7 @@
 
 Sometimes, a change to Pkl is large enough that it makes sense to create a proposal for the change so that it can be discussed in detail and vetted.
 
-Pkl has a process for managing such designs in a repository called {uri-pkl-evolution}[Pkl Evolutiuon].
+Pkl has a process for managing such designs in a repository called {uri-pkl-evolution}[Pkl Evolution].
 
 == Roadmap
 
@@ -17,4 +17,4 @@ The roadmap describes estimates.
 The Pkl team aims to cut a release in February, June, and October of each year.
 If an item is not complete by the release cutoff date, the roadmap item may be bumped to the next release.
 
-Additionally, as priorities change, it is possible that items can be moved around, or backlogged.
+Additionally, as priorities change, it is possible that items can be moved around or backlogged.

docs/modules/ROOT/partials/component-attributes.adoc

@@ -3,10 +3,10 @@
 // the following attributes must be updated immediately before a release
 
 // pkl version corresponding to current git commit without -dev suffix or git hash
-:pkl-version-no-suffix: 0.28.0
+:pkl-version-no-suffix: 0.28.2
 // tells whether pkl version corresponding to current git commit
 // is a release version (:is-release-version: '') or dev version (:!is-release-version:)
-:!is-release-version:
+:is-release-version: ''
 
 // the remaining attributes do not need to be updated regularly
 

docs/modules/pkl-cli/pages/index.adoc

@@ -1,6 +1,7 @@
 = CLI
 include::ROOT:partial$component-attributes.adoc[]
 :uri-homebrew: https://brew.sh
+:uri-mise: https://mise.jdx.dev
 
 :uri-sonatype-snapshot-download: https://s01.oss.sonatype.org/service/local/artifact/maven/redirect?r=snapshots&g=org.pkl-lang&v={pkl-artifact-version}
 :uri-pkl-macos-amd64-download: {uri-sonatype-snapshot-download}&a=pkl-cli-macos-amd64&e=bin
@@ -84,6 +85,29 @@ ifndef::is-release-version[]
 For instructions, switch to a release version of this page.
 endif::[]
 
+[[mise]]
+=== Mise
+
+On macOS, Linux, and Windows, release versions can be installed with {uri-mise}[Mise].
+
+ifdef::is-release-version[]
+To install Pkl, run:
+
+[source,shell]
+[subs="+attributes"]
+----
+# Install and activate Pkl globally
+mise use -g pkl@{pkl-version}
+
+# Install and activate Pkl locally
+mise use pkl@{pkl-version}
+----
+endif::[]
+
+ifndef::is-release-version[]
+For instructions, switch to a release version of this page.
+endif::[]
+
 [[download]]
 === Download
 

docs/modules/release-notes/pages/0.28.adoc

@@ -1,6 +1,6 @@
 = Pkl 0.28 Release Notes
 :version: 0.28
-:version-minor: 0.28.0
+:version-minor: 0.28.2
 :release-date: February 26th, 2025
 
 include::ROOT:partial$component-attributes.adoc[]
@@ -256,6 +256,10 @@ foo { ...bar...baz } // Syntax error
 
 The minimum Gradle version for the xref:main:pkl-gradle:index.adoc[Gradle Plugin] has been bumped to 8.2 (https://github.com/apple/pkl/pull/901[#901]).
 
+=== Minimum Kotlin version bump
+
+For users of Pkl's Kotlin libraries, the minimum Kotlin version has been bumped to 2.0 (https://github.com/apple/pkl/pull/900[#900]).
+
 === Java/Kotlin API breaking changes
 
 Breaking changes have been made to the Java/Kotlin APIs (https://github.com/apple/pkl/pull/748[#748], https://github.com/apple/pkl/pull/749[#749], https://github.com/apple/pkl/pull/776[#776], https://github.com/apple/pkl/pull/793[#793], https://github.com/apple/pkl/pull/808[#808], https://github.com/apple/pkl/pull/810[#810]).
@@ -337,7 +341,6 @@ For users that use both Pkl and other Truffle languages, this means that their v
 * Documentation improvements (https://github.com/apple/pkl/pull/792[#792], https://github.com/apple/pkl/pull/846[#846], https://github.com/apple/pkl/pull/860[#860], https://github.com/apple/pkl/pull/892[#892], https://github.com/apple/pkl/pull/921[#921], https://github.com/apple/pkl/pull/937[#937], https://github.com/apple/pkl/pull/943[#943], https://github.com/apple/pkl/pull/944[#944], https://github.com/apple/pkl/pull/955[#955], https://github.com/apple/pkl/pull/956[#956], https://github.com/apple/pkl/pull/973[#973]).
 * The repository now requires Java 21 or higher to build (https://github.com/apple/pkl/pull/876[#876]).
 * Enable multi-jdk testing via `-DmultiJdkTesting=true` flag when building Pkl (https://github.com/apple/pkl/pull/876[#876]).
-* Pkl's version of Kotlin has been upgraded to 2.0 (https://github.com/apple/pkl/pull/900[#900]).
 * Allow setting commit id via `-DcommitId` flag when building Pkl (https://github.com/apple/pkl/pull/954[#954]).
 
 == Bugs fixed [small]#🐜#

docs/modules/release-notes/pages/changelog.adoc

@@ -1,6 +1,43 @@
 = Changelog
 include::ROOT:partial$component-attributes.adoc[]
 
+[[release-0.28.2]]
+== 0.28.2 (2025-04-17)
+
+=== Fixes
+
+* Adds an optimization when object bodies with generators produce no members (https://github.com/apple/pkl/pull/1013[#1013]).
+* Fixes a runtime crash when `--output-path` points to a directory (https://github.com/apple/pkl/pull/1038[#1038]).
+* Fixes a bug that sometimes causes pkl-doc to crash (https://github.com/apple/pkl/pull/1028[#1028]).
+
+=== Miscellaneous
+
+* Documentation improvements (https://github.com/apple/pkl/pull/982[#982], https://github.com/apple/pkl/pull/1010[#1010], https://github.com/apple/pkl/pull/1031[#1031]).
+* CI improvements (https://github.com/apple/pkl/pull/1020[#1020]).
+
+=== Contributors ❤️
+
+Thank you to all the contributors for this release!
+
+* https://github.com/JeroenSoeters[@JeroenSoeters]
+* https://github.com/KushalP[@KushalP]
+* https://github.com/mbvissers[@mbvissers]
+* https://github.com/pepicrft[@pepicrft]
+
+[[release-0.28.1]]
+== 0.28.1 (2025-03-03)
+
+=== Fixes
+
+* Fixes an issue where Pkl Gradle tasks can possibly fail with `java.lang.UnsatisfiedLinkError` (https://github.com/apple/pkl/pull/995[#995]).
+* Fixes an issue where the artifacts pkl-tools and pkl-config-java-all fail with `java.lang.ClassFormatError` (https://github.com/apple/pkl/pull/998[#998]).
+
+=== Changes
+
+* Adds the ability to configure `native-image` build with Gradle system properties (https://github.com/apple/pkl/pull/1001[#1001]).
++
+Now, any system property starting with `"pkl.native"` will have that prefix stripped, and the rest passed as CLI arguments to `native-image`. For example, the native-image resource cache can be configured by passing Gradle flag `-Dpkl.native-Dpolyglot.engine.userResourceCache=/my/cache/dir`.
+
 [[release-0.28.0]]
 == 0.28.0 (2025-02-26)
 

gradle.properties

@@ -1,7 +1,7 @@
 # suppress inspection "UnusedProperty" for whole file
 
 group=org.pkl-lang
-version=0.28.0
+version=0.28.2
 
 # google-java-format requires jdk.compiler exports
 org.gradle.jvmargs= \

jbang-catalog.json

@@ -2,15 +2,15 @@
   "catalogs": {},
   "aliases": {
     "pkl": {
-      "script-ref": "org.pkl-lang:pkl-cli-java:0.27.0",
+      "script-ref": "org.pkl-lang:pkl-cli-java:0.28.2",
       "java-agents": []
     },
     "pkl-codegen-java": {
-      "script-ref": "org.pkl-lang:pkl-codegen-java:0.27.0",
+      "script-ref": "org.pkl-lang:pkl-codegen-java:0.28.2",
       "java-agents": []
     },
     "pkl-codegen-kotlin": {
-      "script-ref": "org.pkl-lang:pkl-codegen-kotlin:0.27.0",
+      "script-ref": "org.pkl-lang:pkl-codegen-kotlin:0.28.2",
       "java-agents": []
     }
   },

pkl-cli/pkl-cli.gradle.kts

@@ -237,6 +237,16 @@ fun Exec.configureExecutable(
   workingDir(outputFile.map { it.asFile.parentFile })
   executable = "${graalVm.baseDir}/bin/$nativeImageCommandName"
 
+  // For any system properties starting with `pkl.native`, strip off that prefix and pass the rest
+  // through as arguments to native-image.
+  //
+  // Allow setting args using flags like
+  // (-Dpkl.native-Dpolyglot.engine.userResourceCache=/my/cache/dir) when building through Gradle.
+  val extraArgsFromProperties =
+    System.getProperties()
+      .filter { it.key.toString().startsWith("pkl.native") }
+      .map { "${it.key}=${it.value}".substring("pkl.native".length) }
+
   // JARs to exclude from the class path for the native-image build.
   val exclusions = listOf(libs.graalSdk).map { it.get().module.name }
   // https://www.graalvm.org/22.0/reference-manual/native-image/Options/
@@ -294,6 +304,7 @@ fun Exec.configureExecutable(
         // tools.
         addAll(environment.keys.filter { it.startsWith("HOMEBREW_") }.map { "-E$it" })
         addAll(extraArgs)
+        addAll(extraArgsFromProperties)
       }
     }
   )

pkl-cli/src/main/kotlin/org/pkl/cli/CliEvaluator.kt

@@ -19,6 +19,7 @@ import java.io.File
 import java.io.Reader
 import java.io.Writer
 import java.net.URI
+import java.nio.file.Files
 import java.nio.file.Path
 import java.nio.file.StandardOpenOption
 import kotlin.io.path.createParentDirectories
@@ -152,6 +153,12 @@ constructor(
         for ((moduleUri, outputFile) in outputFiles) {
           val moduleSource = toModuleSource(moduleUri, consoleReader)
           val output = evaluator.evaluateExpressionString(moduleSource, options.expression)
+          if (Files.isDirectory(outputFile)) {
+            throw CliException(
+              "Output file `$outputFile` is a directory. " +
+                "Did you mean `--multiple-file-output-path`?"
+            )
+          }
           outputFile.createParentDirectories()
           if (!writtenFiles.contains(outputFile)) {
             // write file even if output is empty to overwrite output from previous runs

pkl-cli/src/test/kotlin/org/pkl/cli/CliEvaluatorTest.kt

@@ -725,6 +725,39 @@ result = someLib.x
     assertThat(output).endsWith("\n")
   }
 
+  @Test
+  fun `file output throws if output file is a directory`() {
+    val sourceFiles =
+      listOf(
+        writePklFile(
+          "test.pkl",
+          """
+          name = "test"
+          output {
+            files {
+              ["\(name).txt"] {
+                text = "test"
+              }
+            } 
+          }
+        """
+            .trimIndent(),
+        )
+      )
+    val err =
+      assertThrows<CliException> {
+        evalToFiles(
+          CliEvaluatorOptions(
+            CliBaseOptions(sourceModules = sourceFiles),
+            outputPath = tempDir.toString(),
+          )
+        )
+      }
+    assertThat(err)
+      .hasMessageContaining("Output file `$tempDir` is a directory. ")
+      .hasMessageContaining("Did you mean `--multiple-file-output-path`?")
+  }
+
   @Test
   fun `multiple file output writes multiple files to the provided directory`() {
     val contents =

pkl-core/src/main/java/org/pkl/core/ast/expression/generator/GeneratorObjectLiteralNode.java

@@ -73,6 +73,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = "checkObjectCannotHaveParameters()")
   protected VmDynamic evalDynamic(VirtualFrame frame, VmDynamic parent) {
     var data = executeChildren(frame, parent, parent.getLength());
+    if (data.hasNoMembers()) {
+      return parent;
+    }
     var result = new VmDynamic(frame.materialize(), parent, data.members(), data.length());
     return data.storeGeneratorFrames(result);
   }
@@ -81,6 +84,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   protected VmTyped evalTyped(VirtualFrame frame, VmTyped parent) {
     VmUtils.checkIsInstantiable(parent.getVmClass(), getParentNode());
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return parent;
+    }
     assert data.hasNoGeneratorFrames();
     return new VmTyped(frame.materialize(), parent, parent.getVmClass(), data.members());
   }
@@ -88,6 +94,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = "checkListingCannotHaveParameters()")
   protected VmListing evalListing(VirtualFrame frame, VmListing parent) {
     var data = executeChildren(frame, parent, parent.getLength());
+    if (data.hasNoMembers()) {
+      return parent;
+    }
     var result = new VmListing(frame.materialize(), parent, data.members(), data.length());
     return data.storeGeneratorFrames(result);
   }
@@ -95,6 +104,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = "checkMappingCannotHaveParameters()")
   protected VmMapping evalMapping(VirtualFrame frame, VmMapping parent) {
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return parent;
+    }
     var result = new VmMapping(frame.materialize(), parent, data.members());
     return data.storeGeneratorFrames(result);
   }
@@ -118,6 +130,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = {"parent == getDynamicClass()", "checkObjectCannotHaveParameters()"})
   protected VmDynamic evalDynamicClass(VirtualFrame frame, VmClass parent) {
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return VmDynamic.empty();
+    }
     var result =
         new VmDynamic(frame.materialize(), parent.getPrototype(), data.members(), data.length());
     return data.storeGeneratorFrames(result);
@@ -126,6 +141,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = {"parent == getMappingClass()", "checkMappingCannotHaveParameters()"})
   protected VmMapping evalMappingClass(VirtualFrame frame, VmClass parent) {
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return VmMapping.empty();
+    }
     var result = new VmMapping(frame.materialize(), parent.getPrototype(), data.members());
     return data.storeGeneratorFrames(result);
   }
@@ -133,6 +151,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   @Specialization(guards = {"parent == getListingClass()", "checkListingCannotHaveParameters()"})
   protected VmListing evalListingClass(VirtualFrame frame, VmClass parent) {
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return VmListing.empty();
+    }
     var result =
         new VmListing(frame.materialize(), parent.getPrototype(), data.members(), data.length());
     return data.storeGeneratorFrames(result);
@@ -142,6 +163,9 @@ public abstract class GeneratorObjectLiteralNode extends ObjectLiteralNode {
   protected VmTyped evalTypedObjectClass(VirtualFrame frame, VmClass parent) {
     VmUtils.checkIsInstantiable(parent, getParentNode());
     var data = executeChildren(frame, parent, 0);
+    if (data.hasNoMembers()) {
+      return parent.getPrototype();
+    }
     assert data.hasNoGeneratorFrames();
     return new VmTyped(frame.materialize(), parent.getPrototype(), parent, data.members());
   }

pkl-core/src/main/java/org/pkl/core/ast/expression/generator/ObjectData.java

@@ -55,6 +55,10 @@ public final class ObjectData {
     return length;
   }
 
+  boolean hasNoMembers() {
+    return members.isEmpty();
+  }
+
   boolean hasNoGeneratorFrames() {
     return generatorFrames.isEmpty();
   }

pkl-core/src/main/java/org/pkl/core/runtime/VmLanguage.java

@@ -33,7 +33,7 @@ import org.pkl.core.util.Nullable;
 @TruffleLanguage.Registration(
     id = "pkl",
     name = "Pkl",
-    version = "0.28.0-dev",
+    version = "0.28.2",
     characterMimeTypes = VmLanguage.MIME_TYPE,
     contextPolicy = ContextPolicy.SHARED)
 public final class VmLanguage extends TruffleLanguage<VmContext> {

pkl-core/src/test/files/LanguageSnippetTests/input/generators/generatorNoMembers.pkl

@@ -0,0 +1,46 @@
+// should only result in one trace in the output; generator object literals that don't add any
+// members should be optimized away.
+res1 {
+  prop = trace("hello")
+}
+
+res2 = (res1) {
+  when (false) {
+    prop2 = 2
+  }
+}
+
+res3 = (res1) {
+  for (_ in List()) {
+    "hello"
+  }
+}
+
+res4 = (res1) {
+  ...List()
+}
+
+res5 = (res1) {
+  when (true) {
+  } else {
+    prop3 = 3
+  }
+}
+
+res6 = (Dynamic) {
+  when (true) {}
+}
+
+res7 = (Mapping) {
+  when (true) {}
+}
+
+class Person {}
+
+res8 = (Person) {
+  when (true) {}
+}
+
+res9 = (Listing) {
+  when (true) {}
+}

pkl-core/src/test/files/LanguageSnippetTests/output/generators/generatorNoMembers.err

@@ -0,0 +1,20 @@
+res1 {
+  prop = "hello"
+}
+res2 {
+  prop = "hello"
+}
+res3 {
+  prop = "hello"
+}
+res4 {
+  prop = "hello"
+}
+res5 {
+  prop = "hello"
+}
+res6 {}
+res7 {}
+res8 {}
+res9 {}
+pkl: TRACE: "hello" = "hello" (file:///$snippetsDir/input/generators/generatorNoMembers.pkl)

pkl-doc/src/main/kotlin/org/pkl/doc/PackageDataGenerator.kt

@@ -414,7 +414,9 @@ private fun findTypesUsedBy(
             enclosingPackage.name,
             enclosingPackage.uri,
             enclosingPackage.version,
-            enclosingType.moduleName.substring(enclosingPackage.name.length + 1).replace('.', '/'),
+            enclosingType.moduleName
+              .substring(enclosingPackage.moduleNamePrefix.length)
+              .replace('.', '/'),
             PClassInfo.MODULE_CLASS_NAME,
           )
         )

pkl-gradle/src/main/java/org/pkl/gradle/task/BasePklTask.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -49,6 +49,11 @@ import org.pkl.core.util.Nullable;
 import org.pkl.gradle.utils.PluginUtils;
 
 public abstract class BasePklTask extends DefaultTask {
+  private static final String TRUFFLE_USE_FALLBACK_RUNTIME_FLAG = "truffle.UseFallbackRuntime";
+
+  private static final String POLYGLOT_WARN_INTERPRETER_ONLY_FLAG =
+      "polyglot.engine.WarnInterpreterOnly";
+
   @Input
   public abstract ListProperty<String> getAllowedModules();
 
@@ -137,9 +142,26 @@ public abstract class BasePklTask extends DefaultTask {
   @Optional
   public abstract ListProperty<String> getHttpNoProxy();
 
+  /**
+   * There are issues with using native libraries in Gradle plugins. As a workaround for now, make
+   * Truffle use an un-optimized runtime.
+   *
+   * @see <a
+   *     href="https://discuss.gradle.org/t/loading-a-native-library-in-a-gradle-plugin/44854">https://discuss.gradle.org/t/loading-a-native-library-in-a-gradle-plugin/44854</a>
+   * @see <a
+   *     href="https://github.com/apple/pkl/issues/988">https://github.com/apple/pkl/issues/988</a>
+   */
+  // TODO: Remove this workaround when ugprading to Truffle 24.2+ (Truffle automatically falls back
+  // in this scenario).
+  protected void withFallbackTruffleRuntime(Runnable task) {
+    System.setProperty(TRUFFLE_USE_FALLBACK_RUNTIME_FLAG, "true");
+    System.setProperty(POLYGLOT_WARN_INTERPRETER_ONLY_FLAG, "false");
+    task.run();
+  }
+
   @TaskAction
   public void runTask() {
-    doRunTask();
+    withFallbackTruffleRuntime(this::doRunTask);
   }
 
   protected abstract void doRunTask();

pkl-gradle/src/main/java/org/pkl/gradle/task/ModulesTask.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -133,7 +133,7 @@ public abstract class ModulesTask extends BasePklTask {
     if (getCliBaseOptions().getNormalizedSourceModules().isEmpty()) {
       throw new InvalidUserDataException("No source modules specified.");
     }
-    doRunTask();
+    withFallbackTruffleRuntime(this::doRunTask);
   }
 
   @Internal

pkl-tools/pkl-tools.gradle.kts

@@ -15,6 +15,8 @@
  */
 import java.nio.charset.StandardCharsets
 import java.util.*
+import kotlin.io.path.createDirectories
+import kotlin.io.path.writeText
 
 plugins {
   pklAllProjects
@@ -65,6 +67,63 @@ val javadocJar by
 
 tasks.shadowJar { archiveBaseName.set("pkl-tools-all") }
 
+private fun Exec.configureTestStartFatJar(launcher: Provider<JavaLauncher>) {
+  dependsOn(tasks.shadowJar)
+  group = "verification"
+
+  // placeholder output to satisfy up-to-date check
+  val outputFile = layout.buildDirectory.file("testStartFatJar/${name}.txt")
+  outputs.file(outputFile)
+
+  inputs.files(tasks.shadowJar)
+  executable = launcher.get().executablePath.asFile.absolutePath
+
+  argumentProviders.add(
+    CommandLineArgumentProvider {
+      buildList {
+        add("-cp")
+        add(tasks.shadowJar.get().outputs.files.singleFile.absolutePath)
+        add("org.pkl.cli.Main")
+        add("eval")
+        add("-x")
+        add("1 + 1")
+        add("pkl:base")
+      }
+    }
+  )
+
+  doLast {
+    outputFile.get().asFile.toPath().let { file ->
+      file.parent.createDirectories()
+      file.writeText("OK")
+    }
+  }
+}
+
+val testStartFatJar by
+  tasks.registering(Exec::class) { configureTestStartFatJar(buildInfo.javaTestLauncher) }
+
+tasks.validateFatJar { dependsOn(testStartFatJar) }
+
+for (jdkTarget in buildInfo.jdkTestRange) {
+  if (buildInfo.jdkToolchainVersion == jdkTarget) {
+    tasks.register("testStartFatJarJdk${jdkTarget.asInt()}") {
+      group = "verification"
+      description = "alias for testStartFatJar"
+      dependsOn(testStartFatJar)
+    }
+  } else {
+    val task =
+      tasks.register("testStartFatJarJdk${jdkTarget.asInt()}", Exec::class) {
+        val launcher = project.javaToolchains.launcherFor { languageVersion = jdkTarget }
+        configureTestStartFatJar(launcher)
+      }
+    if (buildInfo.multiJdkTesting) {
+      tasks.validateFatJar { dependsOn(task) }
+    }
+  }
+}
+
 publishing {
   publications {
     named<MavenPublication>("fatJar") {

stdlib/Benchmark.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -36,7 +36,7 @@
 ///
 /// Warning: Although this module is ready for initial use,
 /// benchmark results may be inaccurate or inconsistent.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.Benchmark
 
 import "pkl:platform" as _platform

stdlib/DocPackageInfo.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -63,7 +63,7 @@
 /// @Deprecated { message = "Use `com.example.Birds.Parrot` instead" }
 /// amends "pkl:PackageInfo"
 /// ```
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.DocPackageInfo
 
 import "pkl:reflect"

stdlib/DocsiteInfo.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -31,7 +31,7 @@
 ///
 /// title = "Title displayed in the header of each page"
 /// ```
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.DocsiteInfo
 
 import "pkl:reflect"

stdlib/EvaluatorSettings.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Common settings for Pkl's own evaluator.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 @Since { version = "0.26.0" }
 module pkl.EvaluatorSettings
 

stdlib/Project.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -64,7 +64,7 @@
 ///   value = project
 /// }
 /// ``` 
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.Project
 
 import "pkl:EvaluatorSettings" as EvaluatorSettingsModule

stdlib/analyze.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -19,7 +19,7 @@
 /// These tools differentiate from [pkl:reflect][reflect] in that they parse Pkl modules, but do not
 /// execute any code within these modules.
 @Since { version = "0.27.0" }
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.analyze
 
 // used by doc comments

stdlib/base.pkl

@@ -17,7 +17,7 @@
 /// Fundamental properties, methods, and classes for writing Pkl programs.
 ///
 /// Members of this module are automatically available in every Pkl module.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.base
 
 import "pkl:jsonnet"

stdlib/json.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// A JSON parser.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.json
 
 /// A JSON parser.

stdlib/jsonnet.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// A [Jsonnet](https://jsonnet.org) renderer.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.jsonnet
 
 /// Constructs an [ImportStr].

stdlib/math.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 ///
 /// Note that some mathematical functions, such as `sign()`, `abs()`, and `round()`,
 /// are directly defined in classes [Number], [Int], and [Float].
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.math
 
 /// The minimum [Int] value: `-9223372036854775808`.

stdlib/platform.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Information about the platform that the current program runs on.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.platform
 
 /// The platform that the current program runs on.

stdlib/protobuf.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,7 +16,7 @@
 
 /// A renderer for [Protocol Buffers](https://developers.google.com/protocol-buffers).
 /// Note: This module is _experimental_ and not ready for production use.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.protobuf
 
 import "pkl:reflect"

stdlib/reflect.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -26,7 +26,7 @@
 /// - Documentation generators (such as *Pkldoc*)
 /// - Code generators (such as *pkl-codegen-java* and *pkl-codegen-kotlin*)
 /// - Domain-specific schema validators
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.reflect
 
 import "pkl:base"

stdlib/release.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Information about the Pkl release that the current program runs on.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.release
 
 import "pkl:semver"

stdlib/semver.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Parsing, comparison, and manipulation of [semantic version](https://semver.org/spec/v2.0.0.html) numbers.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.semver
 
 /// Tells whether [version] is a valid semantic version number.

stdlib/settings.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -19,7 +19,7 @@
 /// Every settings file must amend this module.
 /// Unless CLI commands and build tool plugins are explicitly configured with a settings file,
 /// they will use `~/.pkl/settings.pkl` or the defaults specified in this module.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.settings
 
 import "pkl:EvaluatorSettings"

stdlib/shell.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// Utilities for generating shell scripts.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.shell
 
 /// Escapes [str] by enclosing it in single quotes.

stdlib/test.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 ///
 /// To write tests, amend this module and define [facts] or [examples] (or both).
 /// To run tests, evaluate the amended module.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 open module pkl.test
 
 /// Named groups of boolean expressions that are expected to evaluate to [true].

stdlib/xml.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// An XML renderer.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.xml
 
 /// Renders values as XML.

stdlib/yaml.pkl

@@ -1,5 +1,5 @@
 //===----------------------------------------------------------------------===//
-// Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
+// Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
 //===----------------------------------------------------------------------===//
 
 /// A YAML 1.2 compliant YAML parser.
-@ModuleInfo { minPklVersion = "0.28.0" }
+@ModuleInfo { minPklVersion = "0.28.2" }
 module pkl.yaml
 
 /// A YAML parser.