8 files changed, 81 insertions, 1 deletions
diff --git a/examples/02-sum/hobgoblin.json5 b/examples/02-sum/hobgoblin.json5
index 1ec9568..2bf59c3 100644
--- a/examples/02-sum/hobgoblin.json5
+++ b/examples/02-sum/hobgoblin.json5
@@ -5,5 +5,9 @@
       path: "output/java/src/gen/java",
       packageName: "org.zwobble.example.types"
     },
+    {
+      generator: "rust-types",
+      path: "output/rust/src",
+    },
   ],
 }
diff --git a/examples/02-sum/output/rust/.gitignore b/examples/02-sum/output/rust/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/examples/02-sum/output/rust/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/examples/02-sum/output/rust/Cargo.lock b/examples/02-sum/output/rust/Cargo.lock
new file mode 100644
index 0000000..9dc6e3e
--- /dev/null
+++ b/examples/02-sum/output/rust/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "example"
+version = "0.1.0"
diff --git a/examples/02-sum/output/rust/Cargo.toml b/examples/02-sum/output/rust/Cargo.toml
new file mode 100644
index 0000000..5d4c622
--- /dev/null
+++ b/examples/02-sum/output/rust/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "example"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/examples/02-sum/output/rust/rust-toolchain.toml b/examples/02-sum/output/rust/rust-toolchain.toml
new file mode 100644
index 0000000..4fedb95
--- /dev/null
+++ b/examples/02-sum/output/rust/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.96"
diff --git a/examples/02-sum/output/rust/src/main.rs b/examples/02-sum/output/rust/src/main.rs
new file mode 100644
index 0000000..010ea2a
--- /dev/null
+++ b/examples/02-sum/output/rust/src/main.rs
@@ -0,0 +1,16 @@
+mod shapes;
+
+use shapes::{Rectangle, Shape, Triangle};
+
+fn main() {
+    let shape = create_shape();
+
+    let area = match shape {
+        Shape::Rectangle(rectangle) => rectangle.width * rectangle.height,
+        Shape::Triangle(triangle) => triangle.width * triangle.height / 2,
+    };
+}
+
+fn create_shape() -> Shape {
+    Shape::Rectangle(Rectangle { width: 10, height: 25 })
+}
diff --git a/examples/02-sum/output/rust/src/shapes.rs b/examples/02-sum/output/rust/src/shapes.rs
new file mode 100644
index 0000000..9bb32f4
--- /dev/null
+++ b/examples/02-sum/output/rust/src/shapes.rs
@@ -0,0 +1,15 @@
+/// A 2D shape.
+pub enum Shape {
+    Rectangle(crate::shapes::Rectangle),
+    Triangle(crate::shapes::Triangle),
+}
+
+pub struct Rectangle {
+    pub width: i32,
+    pub height: i32,
+}
+
+pub struct Triangle {
+    pub width: i32,
+    pub height: i32,
+}
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 99151c4..e681a3e 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
@@ -92,7 +92,7 @@ public class RustTypesGenerator implements Generator {
             }
 
             case TypedSumDefinitionNode sumDefinition -> {
-                yield List.of();
+                yield generateSumDefinition(sumDefinition, context);
             }
         };
     }
@@ -115,6 +115,26 @@ public class RustTypesGenerator implements Generator {
         return List.of(rustStruct);
     }
 
+    private List<RustItem> generateSumDefinition(
+        TypedSumDefinitionNode sumDefinition,
+        Context context
+    ) {
+        var rustEnumName = generateTypeName(sumDefinition.name());
+
+        var rustVariants = sumDefinition.variants().stream()
+            .map(variant -> new RustEnumVariant(
+                generateVariantName(variant.type().value()),
+                new RustEnumVariantTuple(List.of(
+                    new RustTupleField(generateRustTypeExpression(variant.type(), context))
+                ))
+            ))
+            .toList();
+
+        var rustEnum = new RustEnum(rustEnumName, rustVariants, sumDefinition.docComment());
+
+        return List.of(rustEnum);
+    }
+
     private RustType generateRustTypeExpression(
         TypedTypeLevelExpressionNode<Type> type,
         Context context
@@ -196,6 +216,15 @@ public class RustTypesGenerator implements Generator {
         return new RustIdentifier(Casing.lowerCamelCaseToSnakeCase(part));
     }
 
+    private RustIdentifier generateVariantName(Type type) {
+        if (type instanceof StructType structType) {
+            return generateTypeName(structType.name());
+        } else {
+            throw new UnsupportedOperationException("TODO");
+        }
+
+    }
+
     private static class Context {
         private final NamespaceName currentNamespaceName;