3 files changed, 33 insertions, 1 deletions
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedNamespaceStatementNode.java b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedNamespaceStatementNode.java
index c7b4cac..cab5156 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedNamespaceStatementNode.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedNamespaceStatementNode.java
@@ -1,4 +1,4 @@
 package org.zwobble.hobgoblin.compiler.ast.untyped;
 
-public sealed interface UntypedNamespaceStatementNode extends UntypedNode permits UntypedStructDefinitionNode {
+public sealed interface UntypedNamespaceStatementNode extends UntypedNode permits UntypedStructDefinitionNode, UntypedSumDefinitionNode {
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedSumDefinitionNode.java b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedSumDefinitionNode.java
new file mode 100644
index 0000000..7969806
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedSumDefinitionNode.java
@@ -0,0 +1,12 @@
+package org.zwobble.hobgoblin.compiler.ast.untyped;
+
+import org.zwobble.hobgoblin.compiler.sources.Source;
+
+import java.util.List;
+
+public record UntypedSumDefinitionNode(
+    String name,
+    List<UntypedTypeLevelExpressionNode> variants,
+    Source source
+) implements UntypedNamespaceStatementNode {
+}
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/typechecker/TypeChecker.java b/src/main/java/org/zwobble/hobgoblin/compiler/typechecker/TypeChecker.java
index 7678f94..bb8c9d3 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/typechecker/TypeChecker.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/typechecker/TypeChecker.java
@@ -41,6 +41,9 @@ public class TypeChecker {
         switch (untyped) {
             case UntypedStructDefinitionNode untypedStructDefinition ->
                 declareStructDefinition(untypedStructDefinition, context);
+
+            case UntypedSumDefinitionNode untypedSumDefinition ->
+                declareSumDefinition(untypedSumDefinition, context);
         }
     }
 
@@ -51,6 +54,9 @@ public class TypeChecker {
         return switch (untyped) {
             case UntypedStructDefinitionNode untypedStructDefinition ->
                 defineStructDefinition(untypedStructDefinition, context);
+
+            case UntypedSumDefinitionNode untypedSumDefinition ->
+                defineSumDefinition(untypedSumDefinition, context);
         };
     }
 
@@ -64,6 +70,13 @@ public class TypeChecker {
         context.define(untyped.name(), new TypeLevelValueType(structType));
     }
 
+    private static void declareSumDefinition(
+        UntypedSumDefinitionNode untyped,
+        TypeCheckerNamespaceContext context
+    ) {
+        throw new UnsupportedOperationException("TODO");
+    }
+
     private static TypedStructDefinitionNode defineStructDefinition(
         UntypedStructDefinitionNode untyped,
         TypeCheckerNamespaceContext context
@@ -87,6 +100,13 @@ public class TypeChecker {
         );
     }
 
+    private static TypedNamespaceStatementNode defineSumDefinition(
+        UntypedSumDefinitionNode untyped,
+        TypeCheckerNamespaceContext context
+    ) {
+        throw new UnsupportedOperationException("TODO");
+    }
+
     private static TypedTypeLevelExpressionNode<Type> typeCheckMetaType(
         UntypedTypeLevelExpressionNode untyped,
         TypeCheckerNamespaceContext context