From 2f76934bf2aa59f78b671c722b73f0d69c7adbd3 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 31 Jul 2026 10:57:39 +0100
Subject: Handle singleton structs in Rust

---
 examples/12-transient-0/output/rust/src/gen/data.rs        |  3 +++
 .../12-transient-0/output/rust/src/gen/data/transient_0.rs |  8 ++++++++
 examples/12-transient-0/output/rust/src/lib.rs             | 14 +++++++++++++-
 3 files changed, 24 insertions(+), 1 deletion(-)

(limited to 'examples/12-transient-0/output/rust')

diff --git a/examples/12-transient-0/output/rust/src/gen/data.rs b/examples/12-transient-0/output/rust/src/gen/data.rs
index 4ec0524..aef9f69 100644
--- a/examples/12-transient-0/output/rust/src/gen/data.rs
+++ b/examples/12-transient-0/output/rust/src/gen/data.rs
@@ -1,5 +1,8 @@
 // Generated by hobgoblin.
 
+#[derive(Debug, Hash, PartialEq)]
+pub struct StructSingleton;
+
 #[derive(Debug, Hash, PartialEq)]
 pub struct StructWithBool {
     pub a: ::core::primitive::bool,
diff --git a/examples/12-transient-0/output/rust/src/gen/data/transient_0.rs b/examples/12-transient-0/output/rust/src/gen/data/transient_0.rs
index ea4a459..ca9beaf 100644
--- a/examples/12-transient-0/output/rust/src/gen/data/transient_0.rs
+++ b/examples/12-transient-0/output/rust/src/gen/data/transient_0.rs
@@ -1,5 +1,13 @@
 // Generated by hobgoblin.
 
+pub fn encode_struct_singleton(value: &crate::data::StructSingleton, writer: &mut impl std::io::Write, shared_values: &mut ::std::collections::HashMap::<::core::primitive::usize, ::core::primitive::i64>) -> ::std::io::Result::<()> {
+    ::std::io::Result::Ok(())
+}
+
+pub fn decode_struct_singleton(reader: &mut impl std::io::Read, shared_values: &mut ::std::vec::Vec::<::std::sync::Arc::<dyn ::std::any::Any + ::std::marker::Sync + ::std::marker::Send>>) -> ::std::io::Result::<crate::data::StructSingleton> {
+    ::std::io::Result::Ok(crate::data::StructSingleton)
+}
+
 pub fn encode_struct_with_bool(value: &crate::data::StructWithBool, writer: &mut impl std::io::Write, shared_values: &mut ::std::collections::HashMap::<::core::primitive::usize, ::core::primitive::i64>) -> ::std::io::Result::<()> {
     crate::transient_0::encode_bool(&value.a, writer, shared_values)?;
     crate::transient_0::encode_bool(&value.b, writer, shared_values)?;
diff --git a/examples/12-transient-0/output/rust/src/lib.rs b/examples/12-transient-0/output/rust/src/lib.rs
index 3a02936..365a352 100644
--- a/examples/12-transient-0/output/rust/src/lib.rs
+++ b/examples/12-transient-0/output/rust/src/lib.rs
@@ -8,7 +8,19 @@ mod test {
     use std::path::PathBuf;
     use std::sync::Arc;
     use std::collections::HashMap;
-    use super::data::{EnumWithVariants, StructWithBool, StructWithDifferentSharedTypes, StructWithEnum, StructWithInt32, StructWithInt64, StructWithList, StructWithListOfShared, StructWithOption, StructWithSharedSumAndVariant, StructWithString, StructWithStruct, StructWithSum, SumWithVariants, VariantOne, VariantTwo };
+    use super::data::{EnumWithVariants, StructSingleton, StructWithBool, StructWithDifferentSharedTypes, StructWithEnum, StructWithInt32, StructWithInt64, StructWithList, StructWithListOfShared, StructWithOption, StructWithSharedSumAndVariant, StructWithString, StructWithStruct, StructWithSum, SumWithVariants, VariantOne, VariantTwo };
+
+    #[test]
+    fn struct_singleton() {
+        let value = StructSingleton;
+
+        assert_round_trip_encoding(
+            "StructSingleton",
+            value,
+            super::data::transient_0::encode_struct_singleton,
+            super::data::transient_0::decode_struct_singleton,
+        );
+    }
 
     #[test]
     fn struct_with_bool() {
-- 
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