From 6eb866fe831d85fbc5a492df711afcda26b2df6f Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 14 Aug 2026 11:07:46 +0100
Subject: Support generic structs in rust-types

---
 .../compiler/output/generators/rust/RustGenerator.java  |  2 +-
 .../output/generators/rusttypes/RustTypesGenerator.java | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 2 deletions(-)

(limited to 'src/main/java/org')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rust/RustGenerator.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rust/RustGenerator.java
index 089a854..fae9066 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rust/RustGenerator.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/generators/rust/RustGenerator.java
@@ -79,7 +79,7 @@ public class RustGenerator {
             }
 
             case TypeParam typeParam -> {
-                throw new UnsupportedOperationException("TODO");
+                yield RustPath.of(this.generateTypeName(typeParam.name()));
             }
         };
     }
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 2070ec3..a5c2118 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
@@ -7,7 +7,9 @@ import org.zwobble.hobgoblin.compiler.output.generators.rust.RustGenerator;
 import org.zwobble.hobgoblin.compiler.output.generators.rust.RustGeneratorConfig;
 import org.zwobble.hobgoblin.compiler.output.lang.rust.ast.*;
 import org.zwobble.hobgoblin.compiler.typechecker.TypesInfo;
+import org.zwobble.hobgoblin.compiler.types.SimpleStructType;
 import org.zwobble.hobgoblin.compiler.types.Type;
+import org.zwobble.hobgoblin.compiler.types.TypeOrConstructor;
 import org.zwobble.json5.reader.Json5ObjectReader;
 
 import java.io.IOException;
@@ -127,6 +129,19 @@ public class RustTypesGenerator implements Generator {
 
         var rustStructName = this.rustGenerator.generateTypeName(structDefinition.name());
 
+        var rustTypeParams = switch (structDefinition.typeOrConstructor()) {
+            case TypeOrConstructor.Constructor<SimpleStructType> constructor ->
+                constructor.value().params().stream()
+                    .map(typeParam -> new RustTypeParam(
+                        this.rustGenerator.generateTypeName(typeParam.name()),
+                        List.of()
+                    ))
+                    .toList();
+
+            case TypeOrConstructor.Type<SimpleStructType> _ ->
+                List.<RustTypeParam>of();
+        };
+
         var rustFields = structDefinition.fields().map(
             fields -> fields.stream()
                 .map(field -> new RustStructField(
@@ -139,7 +154,7 @@ public class RustTypesGenerator implements Generator {
         var rustStruct = new RustStructStruct(
             rustAttributes,
             rustStructName,
-            List.of(),
+            rustTypeParams,
             rustFields,
             structDefinition.docComment()
         );
-- 
cgit v1.2.3