From 578bf1f04b48f48225cfa794a27426cca4f6384a Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 31 Jul 2026 10:50:10 +0100
Subject: Support singleton structs

---
 examples/03-sum/output/rust/src/lib.rs    | 29 ++++++++++++++++++++++++++++
 examples/03-sum/output/rust/src/shapes.rs | 32 +++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 examples/03-sum/output/rust/src/lib.rs
 create mode 100644 examples/03-sum/output/rust/src/shapes.rs

(limited to 'examples/03-sum/output/rust/src')

diff --git a/examples/03-sum/output/rust/src/lib.rs b/examples/03-sum/output/rust/src/lib.rs
new file mode 100644
index 0000000..f961002
--- /dev/null
+++ b/examples/03-sum/output/rust/src/lib.rs
@@ -0,0 +1,29 @@
+mod shapes;
+
+use shapes::{Rectangle, Shape, Triangle};
+
+fn area(shape: &Shape) -> i32 {
+    match shape {
+        Shape::Rectangle(rectangle) => rectangle.width * rectangle.height,
+        Shape::Triangle(triangle) => triangle.width * triangle.height / 2,
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::shapes::{Rectangle, Shape, Triangle};
+
+    #[test]
+    fn rectangle() {
+        let rectangle = Shape::Rectangle(Rectangle { width: 10, height: 25 });
+        let area = super::area(&rectangle);
+        assert_eq!(area, 250);
+    }
+
+    #[test]
+    fn triangle() {
+        let triangle = Shape::Triangle(Triangle { width: 10, height: 25 });
+        let area = super::area(&triangle);
+        assert_eq!(area, 125);
+    }
+}
diff --git a/examples/03-sum/output/rust/src/shapes.rs b/examples/03-sum/output/rust/src/shapes.rs
new file mode 100644
index 0000000..a0a9b7f
--- /dev/null
+++ b/examples/03-sum/output/rust/src/shapes.rs
@@ -0,0 +1,32 @@
+// Generated by hobgoblin.
+
+/// A 2D shape.
+#[derive(Debug, Hash, PartialEq)]
+pub enum Shape {
+    Rectangle(crate::shapes::Rectangle),
+    Triangle(crate::shapes::Triangle),
+}
+
+impl ::std::convert::From::<crate::shapes::Rectangle> for crate::shapes::Shape {
+    fn from(value: crate::shapes::Rectangle) -> Self {
+        Self::Rectangle(value)
+    }
+}
+
+impl ::std::convert::From::<crate::shapes::Triangle> for crate::shapes::Shape {
+    fn from(value: crate::shapes::Triangle) -> Self {
+        Self::Triangle(value)
+    }
+}
+
+#[derive(Debug, Hash, PartialEq)]
+pub struct Rectangle {
+    pub width: ::core::primitive::i32,
+    pub height: ::core::primitive::i32,
+}
+
+#[derive(Debug, Hash, PartialEq)]
+pub struct Triangle {
+    pub width: ::core::primitive::i32,
+    pub height: ::core::primitive::i32,
+}
-- 
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