From 28e1e22e01d5a845a3d599efe8db4a78789c8ab9 Mon Sep 17 00:00:00 2001
From: Sean Bowe <ewillbefull@gmail.com>
Date: Sat, 21 Mar 2026 07:46:37 -0600
Subject: [PATCH] ff_derive: update syn, num-bigint, addchain

---
 Cargo.lock           | 30 +++++++++---------------------
 ff_derive/Cargo.toml |  6 +++---
 ff_derive/src/lib.rs | 19 ++++++-------------
 3 files changed, 18 insertions(+), 37 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 220e21e..d73bcdf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 4
 
 [[package]]
 name = "addchain"
-version = "0.2.0"
+version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b2e69442aa5628ea6951fa33e24efe8313f4321a91bd729fc2f75bdfc858570"
+checksum = "5665045de74fda906c0abfaec40cf2551f88c34dccea869f3fe950dde7209764"
 dependencies = [
  "num-bigint",
  "num-integer",
@@ -113,7 +113,7 @@ dependencies = [
  "num-traits",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
@@ -213,11 +213,10 @@ checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
 
 [[package]]
 name = "num-bigint"
-version = "0.3.3"
+version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f6f7833f2cbf2360a6cfd58cd41a53aa7a90bd4c202f5b1c7dd2ed73c57b2c3"
+checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
 dependencies = [
- "autocfg",
  "num-integer",
  "num-traits",
 ]
@@ -247,7 +246,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "479ca8adacdd7ce8f1fb39ce9ecccbfe93a3f1344b3d0d97f20bc0196208f62b"
 dependencies = [
  "proc-macro2",
- "syn 2.0.114",
+ "syn",
 ]
 
 [[package]]
@@ -318,7 +317,7 @@ checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.114",
+ "syn",
 ]
 
 [[package]]
@@ -340,17 +339,6 @@ version = "2.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.114"
@@ -462,7 +450,7 @@ dependencies = [
  "heck",
  "indexmap",
  "prettyplease",
- "syn 2.0.114",
+ "syn",
  "wasm-metadata",
  "wit-bindgen-core",
  "wit-component",
@@ -478,7 +466,7 @@ dependencies = [
  "prettyplease",
  "proc-macro2",
  "quote",
- "syn 2.0.114",
+ "syn",
  "wit-bindgen-core",
  "wit-bindgen-rust",
 ]
diff --git a/ff_derive/Cargo.toml b/ff_derive/Cargo.toml
index 6ae2aa0..2c37257 100644
--- a/ff_derive/Cargo.toml
+++ b/ff_derive/Cargo.toml
@@ -22,13 +22,13 @@ bits = []
 proc-macro = true
 
 [dependencies]
-addchain = "0.2"
-num-bigint = "0.3"
+addchain = "0.3"
+num-bigint = "0.4"
 num-traits = "0.2"
 num-integer = "0.1"
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "1", features = ["full"] }
+syn = { version = "2", features = ["full"] }
 
 [badges]
 maintenance = { status = "passively-maintained" }
diff --git a/ff_derive/src/lib.rs b/ff_derive/src/lib.rs
index ac9f78d..d40a242 100644
--- a/ff_derive/src/lib.rs
+++ b/ff_derive/src/lib.rs
@@ -302,21 +302,14 @@ fn validate_struct(ast: &syn::DeriveInput, limbs: usize) -> Option<proc_macro2::
 /// Fetch an attribute string from the derived struct.
 fn fetch_attr(name: &str, attrs: &[syn::Attribute]) -> Option<String> {
     for attr in attrs {
-        if let Ok(meta) = attr.parse_meta() {
-            match meta {
-                syn::Meta::NameValue(nv) => {
-                    if nv.path.get_ident().map(|i| i.to_string()) == Some(name.to_string()) {
-                        match nv.lit {
-                            syn::Lit::Str(ref s) => return Some(s.value()),
-                            _ => {
-                                panic!("attribute {} should be a string", name);
-                            }
-                        }
+        if let syn::Meta::NameValue(nv) = &attr.meta {
+            if nv.path.get_ident().map(|i| i.to_string()) == Some(name.to_string()) {
+                if let syn::Expr::Lit(expr_lit) = &nv.value {
+                    if let syn::Lit::Str(ref s) = expr_lit.lit {
+                        return Some(s.value());
                     }
                 }
-                _ => {
-                    panic!("attribute {} should be a string", name);
-                }
+                panic!("attribute {} should be a string", name);
             }
         }
     }