From c7efc2cd45cb69633bdbb3190999478121c5d965 Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Thu, 6 Aug 2026 11:23:07 +0000
Subject: [PATCH 1/2] Bump syn from 2.0.118 to 3.0.3 in /autorust

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.118 to 3.0.3.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/2.0.118...3.0.3)

---
updated-dependencies:
- dependency-name: syn
  dependency-version: 3.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
---
 autorust/Cargo.lock         | 2 +-
 autorust/codegen/Cargo.toml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/autorust/Cargo.lock b/autorust/Cargo.lock
index d4daad03..3fb109f4 100644
--- a/autorust/Cargo.lock
+++ b/autorust/Cargo.lock
@@ -355,7 +355,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_yaml",
- "syn 2.0.118",
+ "syn 3.0.3",
  "thiserror 2.0.20",
  "toml",
 ]
diff --git a/autorust/codegen/Cargo.toml b/autorust/codegen/Cargo.toml
index 17798b63..fe841f08 100644
--- a/autorust/codegen/Cargo.toml
+++ b/autorust/codegen/Cargo.toml
@@ -21,7 +21,7 @@ comrak = "0.54"
 serde = "1"
 http-types = "2"
 once_cell = "1"
-syn = { version = "2", features = ["parsing"] }
+syn = { version = "3", features = ["parsing"] }
 camino = "1"
 askama = "0.16"
 toml = "1.1"

From f7211dd83c21fe56f32f2e9f7191e3f79b8e20be Mon Sep 17 00:00:00 2001
From: John Batty <john@glowingslab.com>
Date: Mon, 10 Aug 2026 15:32:22 +0100
Subject: [PATCH 2/2] Migrate autorust codegen to syn 3.0 API

Adapt codegen.rs to syn 3.0 breaking changes so the generator compiles
with syn 3: TraitBoundModifier enum replaced by TraitBoundModifiers
struct plus a separate `maybe` field, mandatory `attrs` on Type variants,
and removal of the From<...> for Type impls (use explicit variants).

Generated crate output is byte-identical.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 autorust/codegen/src/codegen.rs | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/autorust/codegen/src/codegen.rs b/autorust/codegen/src/codegen.rs
index ee13b0a7..742728e5 100644
--- a/autorust/codegen/src/codegen.rs
+++ b/autorust/codegen/src/codegen.rs
@@ -16,7 +16,7 @@ use syn::{
     punctuated::Punctuated,
     token::{Gt, Impl, Lt},
     AngleBracketedGenericArguments, GenericArgument, Path, PathArguments, PathSegment, TraitBound,
-    TraitBoundModifier, Type, TypeImplTrait, TypeParamBound, TypePath, TypeReference,
+    TraitBoundModifiers, Type, TypeImplTrait, TypeParamBound, TypePath, TypeReference,
 };
 
 /// code generation context
@@ -299,21 +299,22 @@ impl TypeNameCode {
         if self.allow_qualify_models && self.qualify_models {
             tp.path.segments.insert(0, id_models().into());
         }
-        let mut tp = Type::from(tp);
+        let mut tp = Type::Path(tp);
         for _ in 0..self.vec_count {
             tp = generic_type(tp_vec(), tp);
         }
         if self.force_value {
-            tp = Type::from(tp_json_value())
+            tp = Type::Path(tp_json_value())
         }
         if self.is_reference() {
             let tr = TypeReference {
+                attrs: Vec::new(),
                 and_token: Default::default(),
                 lifetime: Default::default(),
                 mutability: Default::default(),
                 elem: Box::new(tp),
             };
-            tp = Type::from(tr);
+            tp = Type::Reference(tr);
         }
         if self.boxed {
             tp = generic_type(tp_box(), tp);
@@ -327,13 +328,15 @@ impl TypeNameCode {
                 let bound = TraitBound {
                     path: path.path,
                     paren_token: None,
-                    modifier: TraitBoundModifier::None,
+                    modifiers: TraitBoundModifiers::default(),
+                    maybe: None,
                     lifetimes: None,
                 };
                 let bound = TypeParamBound::Trait(bound);
                 let mut bounds = Punctuated::new();
                 bounds.push(bound);
                 tp = Type::ImplTrait(TypeImplTrait {
+                    attrs: Vec::new(),
                     bounds,
                     impl_token: Impl::default(),
                 });
@@ -378,7 +381,7 @@ fn generic_type(mut wrap_tp: TypePath, tp: Type) -> Type {
     if let Some(v) = wrap_tp.path.segments.last_mut() {
         v.arguments = arguments
     }
-    Type::from(wrap_tp)
+    Type::Path(wrap_tp)
 }
 
 impl From<TypePath> for TypeNameCode {
@@ -434,7 +437,11 @@ fn segments_to_type_path(segments: Vec<PathSegment>) -> TypePath {
         segments: punctuated,
         leading_colon: None,
     };
-    TypePath { path, qself: None }
+    TypePath {
+        attrs: Vec::new(),
+        path,
+        qself: None,
+    }
 }
 
 fn idents_to_type_path(idents: Vec<Ident>) -> TypePath {