Address warning diagnostics (#1395)

This addressess various warning diagnostics throughout the codebase.

pkl-parser/src/main/java/org/pkl/parser/syntax/Annotation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -32,7 +32,9 @@ public class Annotation extends AbstractNode {
 
   public Type getType() {
     assert children != null;
-    return (Type) children.get(0);
+    var ret = (Type) children.get(0);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable ObjectBody getBody() {

pkl-parser/src/main/java/org/pkl/parser/syntax/Class.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -54,12 +54,16 @@ public final class Class extends AbstractNode {
 
   public Keyword getClassKeyword() {
     assert children != null;
-    return (Keyword) children.get(keywordOffset);
+    var ret = (Keyword) children.get(keywordOffset);
+    assert ret != null;
+    return ret;
   }
 
   public Identifier getName() {
     assert children != null;
-    return (Identifier) children.get(keywordOffset + 1);
+    var ret = (Identifier) children.get(keywordOffset + 1);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable TypeParameterList getTypeParameterList() {

pkl-parser/src/main/java/org/pkl/parser/syntax/ClassMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -57,7 +57,9 @@ public class ClassMethod extends AbstractNode {
 
   public Identifier getName() {
     assert children != null;
-    return (Identifier) children.get(nameOffset);
+    var ret = (Identifier) children.get(nameOffset);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable TypeParameterList getTypeParameterList() {
@@ -67,7 +69,9 @@ public class ClassMethod extends AbstractNode {
 
   public ParameterList getParameterList() {
     assert children != null;
-    return (ParameterList) children.get(nameOffset + 2);
+    var ret = (ParameterList) children.get(nameOffset + 2);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable TypeAnnotation getTypeAnnotation() {

pkl-parser/src/main/java/org/pkl/parser/syntax/ClassProperty.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -54,7 +54,9 @@ public final class ClassProperty extends AbstractNode {
 
   public Identifier getName() {
     assert children != null;
-    return (Identifier) children.get(nameOffset);
+    var ret = (Identifier) children.get(nameOffset);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable TypeAnnotation getTypeAnnotation() {

pkl-parser/src/main/java/org/pkl/parser/syntax/DocComment.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2026 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 +18,6 @@ package org.pkl.parser.syntax;
 import java.util.List;
 import org.pkl.parser.ParserVisitor;
 import org.pkl.parser.Span;
-import org.pkl.parser.util.Nullable;
 
 public final class DocComment extends AbstractNode {
   private final List<Span> spans;
@@ -38,7 +37,7 @@ public final class DocComment extends AbstractNode {
   }
 
   @Override
-  public <T> @Nullable T accept(ParserVisitor<? extends T> visitor) {
+  public <T> T accept(ParserVisitor<? extends T> visitor) {
     return visitor.visitDocComment(this);
   }
 

pkl-parser/src/main/java/org/pkl/parser/syntax/Expr.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -22,6 +22,7 @@ import org.pkl.parser.ParserVisitor;
 import org.pkl.parser.Span;
 import org.pkl.parser.util.Nullable;
 
+@SuppressWarnings("unused")
 public abstract sealed class Expr extends AbstractNode {
 
   public Expr(Span span, @Nullable List<? extends @Nullable Node> children) {
@@ -200,7 +201,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -216,7 +219,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -235,7 +240,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public StringConstant getImportStr() {
       assert children != null;
-      return (StringConstant) children.get(0);
+      var ret = (StringConstant) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public boolean isGlob() {
@@ -258,7 +265,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public ReadType getReadType() {
@@ -285,7 +294,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(0);
+      var ret = (Identifier) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable ArgumentList getArgumentList() {
@@ -314,12 +325,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(1);
+      var ret = (Identifier) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public boolean isNullable() {
@@ -344,7 +359,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(0);
+      var ret = (Identifier) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable ArgumentList getArgumentList() {
@@ -365,7 +382,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getArg() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -381,12 +400,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getArg() {
       assert children != null;
-      return (Expr) children.get(1);
+      var ret = (Expr) children.get(1);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -402,17 +425,23 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getCond() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getThen() {
       assert children != null;
-      return (Expr) children.get(1);
+      var ret = (Expr) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getEls() {
       assert children != null;
-      return (Expr) children.get(2);
+      var ret = (Expr) children.get(2);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -428,17 +457,23 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Parameter getParameter() {
       assert children != null;
-      return (Parameter) children.get(0);
+      var ret = (Parameter) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getBindingExpr() {
       assert children != null;
-      return (Expr) children.get(1);
+      var ret = (Expr) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(2);
+      var ret = (Expr) children.get(2);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -454,12 +489,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public ParameterList getParameterList() {
       assert children != null;
-      return (ParameterList) children.get(0);
+      var ret = (ParameterList) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(1);
+      var ret = (Expr) children.get(1);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -475,7 +514,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -496,7 +537,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public ObjectBody getBody() {
       assert children != null;
-      return (ObjectBody) children.get(1);
+      var ret = (ObjectBody) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public Span newSpan() {
@@ -516,12 +559,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public ObjectBody getBody() {
       assert children != null;
-      return (ObjectBody) children.get(1);
+      var ret = (ObjectBody) children.get(1);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -537,7 +584,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -553,7 +602,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -569,7 +620,9 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -588,12 +641,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getLeft() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Expr getRight() {
       assert children != null;
-      return (Expr) children.get(1);
+      var ret = (Expr) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public Operator getOp() {
@@ -608,12 +665,12 @@ public abstract sealed class Expr extends AbstractNode {
     @SuppressWarnings("ConstantValue")
     @Override
     public boolean equals(Object o) {
-      if (this == o) {
-        return true;
-      }
       if (o == null || getClass() != o.getClass()) {
         return false;
       }
+      if (this == o) {
+        return true;
+      }
       BinaryOperatorExpr binaryOp = (BinaryOperatorExpr) o;
       return Objects.deepEquals(children, binaryOp.children)
           && op == binaryOp.op
@@ -638,12 +695,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Type getType() {
       assert children != null;
-      return (Type) children.get(1);
+      var ret = (Type) children.get(1);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -659,12 +720,16 @@ public abstract sealed class Expr extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public Type getType() {
       assert children != null;
-      return (Type) children.get(1);
+      var ret = (Type) children.get(1);
+      assert ret != null;
+      return ret;
     }
   }
 }

pkl-parser/src/main/java/org/pkl/parser/syntax/ExtendsOrAmendsClause.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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 +36,9 @@ public class ExtendsOrAmendsClause extends AbstractNode {
 
   public StringConstant getUrl() {
     assert children != null;
-    return (StringConstant) children.get(0);
+    var ret = (StringConstant) children.get(0);
+    assert ret != null;
+    return ret;
   }
 
   public Type getType() {
@@ -58,12 +60,12 @@ public class ExtendsOrAmendsClause extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     if (!super.equals(o)) {
       return false;
     }

pkl-parser/src/main/java/org/pkl/parser/syntax/Identifier.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -56,12 +56,12 @@ public final class Identifier extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     Identifier identifier = (Identifier) o;
     return Objects.equals(value, identifier.value) && Objects.equals(span, identifier.span);
   }

pkl-parser/src/main/java/org/pkl/parser/syntax/ImportClause.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -37,7 +37,9 @@ public final class ImportClause extends AbstractNode {
 
   public StringConstant getImportStr() {
     assert children != null;
-    return (StringConstant) children.get(0);
+    var ret = (StringConstant) children.get(0);
+    assert ret != null;
+    return ret;
   }
 
   public boolean isGlob() {
@@ -57,12 +59,12 @@ public final class ImportClause extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     if (!super.equals(o)) {
       return false;
     }

pkl-parser/src/main/java/org/pkl/parser/syntax/Modifier.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -44,12 +44,12 @@ public final class Modifier extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     Modifier modifier = (Modifier) o;
     return value == modifier.value && Objects.equals(span, modifier.span);
   }

pkl-parser/src/main/java/org/pkl/parser/syntax/ModuleDecl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -83,6 +83,8 @@ public final class ModuleDecl extends AbstractNode {
     if (extendsOrAmends != null) {
       return start.endWith(extendsOrAmends.span());
     }
-    return start.endWith(children.get(nameOffset + 1).span());
+    var end = children.get(nameOffset + 1);
+    assert end != null;
+    return start.endWith(end.span());
   }
 }

pkl-parser/src/main/java/org/pkl/parser/syntax/ObjectMember.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -22,6 +22,7 @@ import org.pkl.parser.ParserVisitor;
 import org.pkl.parser.Span;
 import org.pkl.parser.util.Nullable;
 
+@SuppressWarnings("unused")
 public abstract sealed class ObjectMember extends AbstractNode {
 
   public ObjectMember(Span span, @Nullable List<? extends @Nullable Node> children) {
@@ -40,7 +41,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -65,7 +68,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(identifierOffset);
+      var ret = (Identifier) children.get(identifierOffset);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable TypeAnnotation getTypeAnnotation() {
@@ -106,12 +111,16 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Keyword getFunctionKeyword() {
       assert children != null;
-      return (Keyword) children.get(identifierOffset);
+      var ret = (Keyword) children.get(identifierOffset);
+      assert ret != null;
+      return ret;
     }
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(identifierOffset + 1);
+      var ret = (Identifier) children.get(identifierOffset + 1);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable TypeParameterList getTypeParameterList() {
@@ -121,7 +130,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public ParameterList getParamList() {
       assert children != null;
-      return (ParameterList) children.get(identifierOffset + 3);
+      var ret = (ParameterList) children.get(identifierOffset + 3);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable TypeAnnotation getTypeAnnotation() {
@@ -131,7 +142,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(identifierOffset + 5);
+      var ret = (Expr) children.get(identifierOffset + 5);
+      assert ret != null;
+      return ret;
     }
 
     @SuppressWarnings("DuplicatedCode")
@@ -147,7 +160,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
       Span end;
       var typeAnnotation = children.get(identifierOffset + 4);
       if (typeAnnotation == null) {
-        end = children.get(identifierOffset + 3).span();
+        var stop = children.get(identifierOffset + 3);
+        assert stop != null;
+        end = stop.span();
       } else {
         end = typeAnnotation.span();
       }
@@ -168,7 +183,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getPred() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable Expr getExpr() {
@@ -195,7 +212,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getKey() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable Expr getValue() {
@@ -225,7 +244,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public boolean isNullable() {
@@ -247,12 +268,12 @@ public abstract sealed class ObjectMember extends AbstractNode {
     @SuppressWarnings("ConstantValue")
     @Override
     public boolean equals(Object o) {
-      if (this == o) {
-        return true;
-      }
       if (o == null || getClass() != o.getClass()) {
         return false;
       }
+      if (this == o) {
+        return true;
+      }
       if (!super.equals(o)) {
         return false;
       }
@@ -279,12 +300,16 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getPredicate() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public ObjectBody getThenClause() {
       assert children != null;
-      return (ObjectBody) children.get(1);
+      var ret = (ObjectBody) children.get(1);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable ObjectBody getElseClause() {
@@ -306,7 +331,9 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Parameter getP1() {
       assert children != null;
-      return (Parameter) children.get(0);
+      var ret = (Parameter) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable Parameter getP2() {
@@ -316,12 +343,16 @@ public abstract sealed class ObjectMember extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(2);
+      var ret = (Expr) children.get(2);
+      assert ret != null;
+      return ret;
     }
 
     public ObjectBody getBody() {
       assert children != null;
-      return (ObjectBody) children.get(3);
+      var ret = (ObjectBody) children.get(3);
+      assert ret != null;
+      return ret;
     }
 
     public Span forSpan() {

pkl-parser/src/main/java/org/pkl/parser/syntax/Parameter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -46,7 +46,9 @@ public abstract sealed class Parameter extends AbstractNode {
 
     public Identifier getIdentifier() {
       assert children != null;
-      return (Identifier) children.get(0);
+      var ret = (Identifier) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable TypeAnnotation getTypeAnnotation() {

pkl-parser/src/main/java/org/pkl/parser/syntax/StringConstant.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -45,12 +45,12 @@ public class StringConstant extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     if (!super.equals(o)) {
       return false;
     }

pkl-parser/src/main/java/org/pkl/parser/syntax/StringPart.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -52,12 +52,12 @@ public abstract sealed class StringPart extends AbstractNode {
     @SuppressWarnings("ConstantValue")
     @Override
     public boolean equals(Object o) {
-      if (this == o) {
-        return true;
-      }
       if (o == null || getClass() != o.getClass()) {
         return false;
       }
+      if (this == o) {
+        return true;
+      }
       if (!super.equals(o)) {
         return false;
       }
@@ -78,7 +78,9 @@ public abstract sealed class StringPart extends AbstractNode {
 
     public Expr getExpr() {
       assert children != null;
-      return (Expr) children.get(0);
+      var ret = (Expr) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 }

pkl-parser/src/main/java/org/pkl/parser/syntax/Type.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -73,7 +73,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public StringConstant getStr() {
       assert children != null;
-      return (StringConstant) children.get(0);
+      var ret = (StringConstant) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -89,7 +91,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public QualifiedIdentifier getName() {
       assert children != null;
-      return (QualifiedIdentifier) children.get(0);
+      var ret = (QualifiedIdentifier) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     public @Nullable TypeArgumentList getArgs() {
@@ -110,7 +114,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public Type getType() {
       assert children != null;
-      return (Type) children.get(0);
+      var ret = (Type) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -126,7 +132,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public Type getType() {
       assert children != null;
-      return (Type) children.get(0);
+      var ret = (Type) children.get(0);
+      assert ret != null;
+      return ret;
     }
   }
 
@@ -142,7 +150,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public Type getType() {
       assert children != null;
-      return (Type) children.get(0);
+      var ret = (Type) children.get(0);
+      assert ret != null;
+      return ret;
     }
 
     @SuppressWarnings("unchecked")
@@ -190,12 +200,12 @@ public abstract sealed class Type extends AbstractNode {
     @SuppressWarnings("ConstantValue")
     @Override
     public boolean equals(Object o) {
-      if (this == o) {
-        return true;
-      }
       if (o == null || getClass() != o.getClass()) {
         return false;
       }
+      if (this == o) {
+        return true;
+      }
       if (!super.equals(o)) {
         return false;
       }
@@ -227,7 +237,9 @@ public abstract sealed class Type extends AbstractNode {
 
     public Type getRet() {
       assert children != null;
-      return (Type) children.get(children.size() - 1);
+      var ret = (Type) children.get(children.size() - 1);
+      assert ret != null;
+      return ret;
     }
   }
 }

pkl-parser/src/main/java/org/pkl/parser/syntax/TypeAlias.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -20,6 +20,7 @@ import org.pkl.parser.ParserVisitor;
 import org.pkl.parser.Span;
 import org.pkl.parser.util.Nullable;
 
+@SuppressWarnings("unused")
 public final class TypeAlias extends AbstractNode {
   private final int modifiersOffset;
   private final int nameOffset;
@@ -54,12 +55,16 @@ public final class TypeAlias extends AbstractNode {
 
   public Keyword getTypealiasKeyword() {
     assert children != null;
-    return (Keyword) children.get(nameOffset);
+    var ret = (Keyword) children.get(nameOffset);
+    assert ret != null;
+    return ret;
   }
 
   public Identifier getName() {
     assert children != null;
-    return (Identifier) children.get(nameOffset + 1);
+    var ret = (Identifier) children.get(nameOffset + 1);
+    assert ret != null;
+    return ret;
   }
 
   public @Nullable TypeParameterList getTypeParameterList() {
@@ -69,7 +74,9 @@ public final class TypeAlias extends AbstractNode {
 
   public Type getType() {
     assert children != null;
-    return (Type) children.get(nameOffset + 3);
+    var ret = (Type) children.get(nameOffset + 3);
+    assert ret != null;
+    return ret;
   }
 
   @SuppressWarnings("DuplicatedCode")
@@ -83,7 +90,9 @@ public final class TypeAlias extends AbstractNode {
         break;
       }
     }
-    var end = children.get(nameOffset + 1).span();
+    var endNode = children.get(nameOffset + 1);
+    assert endNode != null;
+    var end = endNode.span();
     var tparList = children.get(nameOffset + 2);
     if (tparList != null) {
       end = tparList.span();

pkl-parser/src/main/java/org/pkl/parser/syntax/TypeAnnotation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -32,6 +32,8 @@ public class TypeAnnotation extends AbstractNode {
 
   public Type getType() {
     assert children != null;
-    return (Type) children.get(0);
+    var ret = (Type) children.get(0);
+    assert ret != null;
+    return ret;
   }
 }

pkl-parser/src/main/java/org/pkl/parser/syntax/TypeParameter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -40,7 +40,9 @@ public final class TypeParameter extends AbstractNode {
 
   public Identifier getIdentifier() {
     assert children != null;
-    return (Identifier) children.get(0);
+    var ret = (Identifier) children.get(0);
+    assert ret != null;
+    return ret;
   }
 
   @Override
@@ -58,12 +60,12 @@ public final class TypeParameter extends AbstractNode {
   @SuppressWarnings("ConstantValue")
   @Override
   public boolean equals(Object o) {
-    if (this == o) {
-      return true;
-    }
     if (o == null || getClass() != o.getClass()) {
       return false;
     }
+    if (this == o) {
+      return true;
+    }
     if (!super.equals(o)) {
       return false;
     }

pkl-parser/src/test/kotlin/org/pkl/parser/GenericSexpRenderer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2025-2026 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.
@@ -71,19 +71,6 @@ class GenericSexpRenderer(code: String) {
     buf.append(')')
   }
 
-  private fun renderQualifiedAccess(node: Node) {
-    var children = node.children
-    if (children.last().type == NodeType.UNQUALIFIED_ACCESS_EXPR) {
-      children = children.dropLast(1) + collectChildren(children.last())
-    }
-    val toRender = mutableListOf<Node>()
-    for (child in children) {
-      if (child.type in IGNORED_CHILDREN || child.type == NodeType.OPERATOR) continue
-      toRender += child
-    }
-    doRender(name(node), toRender)
-  }
-
   private fun renderDefaultUnionType(node: Node) {
     buf.append(tab)
     buf.append("(defaultUnionType\n")

pkl-parser/src/test/kotlin/org/pkl/parser/SexpRenderer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024-2025 Apple Inc. and the Pkl project authors. All rights reserved.
+ * Copyright © 2024-2026 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.
@@ -1092,7 +1092,7 @@ class SexpRenderer {
   }
 
   companion object {
-    private fun sortModuleEntries(mod: org.pkl.parser.syntax.Module): List<Node> {
+    private fun sortModuleEntries(mod: Module): List<Node> {
       val res = mutableListOf<Node>()
       res += mod.classes
       res += mod.typeAliases