From 72c84ea17a7e4b27cf9428ef23f713e32f5339d3 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 25 Apr 2026 10:56:55 +0100
Subject: Type check struct fields

---
 .../TypeCheckerStructDefinitionTests.java          | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)

(limited to 'src/test/java/org/zwobble')

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerStructDefinitionTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerStructDefinitionTests.java
index b6fddba..f13731f 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerStructDefinitionTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerStructDefinitionTests.java
@@ -2,10 +2,16 @@ package org.zwobble.hobgoblin.compiler.typechecker;
 
 import org.junit.jupiter.api.Test;
 import org.zwobble.hobgoblin.compiler.ast.typed.TypedStructDefinitionNode;
+import org.zwobble.hobgoblin.compiler.ast.typed.TypedStructFieldDefinitionNode;
+import org.zwobble.hobgoblin.compiler.ast.typed.TypedTypeLevelExpressionNode;
+import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedArb;
 import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode;
+import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNode;
 import org.zwobble.hobgoblin.compiler.sources.NullSource;
 import org.zwobble.hobgoblin.compiler.types.NamespaceName;
+import org.zwobble.hobgoblin.compiler.types.ScalarType;
 import org.zwobble.hobgoblin.compiler.types.StructType;
+import org.zwobble.hobgoblin.compiler.types.TypeLevelValueType;
 
 import java.util.List;
 
@@ -33,4 +39,51 @@ public class TypeCheckerStructDefinitionTests {
             )
         ));
     }
+
+    @Test
+    public void fieldsAreTypeChecked() {
+        var int32Type = new ScalarType("Int32");
+        var int64Type = new ScalarType("Int64");
+        var untyped = new UntypedStructDefinitionNode(
+            "X",
+            List.of(
+                new UntypedStructFieldDefinitionNode("a", UntypedArb.typeLevelReference("Int32"), NullSource.INSTANCE),
+                new UntypedStructFieldDefinitionNode("b", UntypedArb.typeLevelReference("Int64"), NullSource.INSTANCE)
+            ),
+            NullSource.INSTANCE
+        );
+        var context = TypeCheckerContextArb.namespaceContext(NamespaceName.of("a", "b"));
+        context.declare(int32Type.name());
+        context.define(int32Type.name(), new TypeLevelValueType(int32Type));
+        context.declare(int64Type.name());
+        context.define(int64Type.name(), new TypeLevelValueType(int64Type));
+
+        var typed = TypeChecker.typeCheckNamespaceStatement(untyped, context);
+
+        assertThat(typed, instanceOf(
+            TypedStructDefinitionNode.class,
+            has(
+                "fields",
+                TypedStructDefinitionNode::fields,
+                isSequence(
+                    allOf(
+                        has("name", TypedStructFieldDefinitionNode::name, equalTo("a")),
+                        has("type", TypedStructFieldDefinitionNode::type, has(
+                            "value",
+                            TypedTypeLevelExpressionNode::value,
+                            equalTo(int32Type)
+                        ))
+                    ),
+                    allOf(
+                        has("name", TypedStructFieldDefinitionNode::name, equalTo("b")),
+                        has("type", TypedStructFieldDefinitionNode::type, has(
+                            "value",
+                            TypedTypeLevelExpressionNode::value,
+                            equalTo(int64Type)
+                        ))
+                    )
+                )
+            )
+        ));
+    }
 }
-- 
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