From f189d982951f7f0e2c3560a20c0d1d8a2b6431d0 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 14 Jul 2026 19:49:24 +0100
Subject: Derive Debug and PartialEq for generated Rust types

---
 .../generators/rusttypes/RustTypesGenerator.java   | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttypes/RustTypesGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttypes/RustTypesGenerator.java
index 19f3365..7695bf4 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttypes/RustTypesGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rusttypes/RustTypesGenerator.java
@@ -92,6 +92,8 @@ public class RustTypesGenerator implements Generator {
         TypedEnumDefinitionNode enumDefinition,
         Context context
     ) {
+        var rustAttributes = List.of(DERIVE_ATTRIBUTE);
+
         var rustEnumName = this.rustGenerator.generateTypeName(enumDefinition.name());
 
         var rustVariants = enumDefinition.variants().stream()
@@ -102,7 +104,7 @@ public class RustTypesGenerator implements Generator {
             .toList();
 
         var rustEnum = new RustEnum(
-            List.of(),
+            rustAttributes,
             rustEnumName,
             rustVariants,
             enumDefinition.docComment()
@@ -111,10 +113,17 @@ public class RustTypesGenerator implements Generator {
         return List.of(rustEnum);
     }
 
+    private static final RustOuterAttribute DERIVE_ATTRIBUTE = new RustOuterAttribute(
+        RustTypePath.of("derive"),
+        Optional.of("(Debug, PartialEq)")
+    );
+
     private List<RustItem> generateStructDefinition(
         TypedStructDefinitionNode structDefinition,
         Context context
     ) {
+        var rustAttributes = List.of(DERIVE_ATTRIBUTE);
+
         var rustStructName = this.rustGenerator.generateTypeName(structDefinition.name());
 
         var rustFields = structDefinition.fields().stream()
@@ -124,7 +133,12 @@ public class RustTypesGenerator implements Generator {
             ))
             .toList();
 
-        var rustStruct = new RustStructStruct(List.of(), rustStructName, rustFields, structDefinition.docComment());
+        var rustStruct = new RustStructStruct(
+            rustAttributes,
+            rustStructName,
+            rustFields,
+            structDefinition.docComment()
+        );
 
         return List.of(rustStruct);
     }
@@ -133,6 +147,8 @@ public class RustTypesGenerator implements Generator {
         TypedSumDefinitionNode sumDefinition,
         Context context
     ) {
+        var rustAttributes = List.of(DERIVE_ATTRIBUTE);
+
         var items = new ArrayList<RustItem>();
 
         var rustEnumName = this.rustGenerator.generateTypeName(sumDefinition.name());
@@ -156,7 +172,7 @@ public class RustTypesGenerator implements Generator {
             .toList();
 
         var rustEnum = new RustEnum(
-            List.of(),
+            rustAttributes,
             rustEnumName,
             rustVariants,
             sumDefinition.docComment()
-- 
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