From 946b8d6bdef4b15a33424c320814d960afb5ace4 Mon Sep 17 00:00:00 2001
From: "Kevin R. Thornton" <krthornt@uci.edu>
Date: Fri, 6 Sep 2024 16:38:45 -0700
Subject: [PATCH] refactor: bump to syn 2.0 (#663)

---
 Cargo.lock              | 27 ++++++++-------------------
 tskit-derive/Cargo.toml |  2 +-
 tskit-derive/src/lib.rs |  4 ++--
 3 files changed, 11 insertions(+), 22 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 97b62763..931653c0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -99,7 +99,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn 2.0.57",
+ "syn",
  "which",
 ]
 
@@ -183,7 +183,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -206,7 +206,7 @@ checksum = "4e018fccbeeb50ff26562ece792ed06659b9c2dae79ece77c4456bb10d9bf79b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -416,7 +416,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d3928fb5db768cb86f891ff014f0144589297e3c6a1aba6ed7cecfdace270c7"
 dependencies = [
  "proc-macro2",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -438,7 +438,7 @@ dependencies = [
  "proc-macro-error-attr2",
  "proc-macro2",
  "quote",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -583,7 +583,7 @@ checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -615,17 +615,6 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ee073c9e4cd00e28217186dbe12796d692868f432bf2e97ee73bed0c56dfa01"
 
-[[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 = "2.0.57"
@@ -654,7 +643,7 @@ checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.57",
+ "syn",
 ]
 
 [[package]]
@@ -687,7 +676,7 @@ version = "0.2.0"
 dependencies = [
  "proc-macro-error2",
  "quote",
- "syn 1.0.109",
+ "syn",
 ]
 
 [[package]]
diff --git a/tskit-derive/Cargo.toml b/tskit-derive/Cargo.toml
index 324ba19b..0cfdbecc 100644
--- a/tskit-derive/Cargo.toml
+++ b/tskit-derive/Cargo.toml
@@ -12,6 +12,6 @@ homepage = "https://github.com/tskit-dev/tskit-rust"
 proc-macro = true
 
 [dependencies]
-syn = { version = "1.0", features = ["derive"] }
+syn = { version = "2.0", features = ["derive"] }
 quote = "1.0"
 proc-macro-error2 = "2.0"
diff --git a/tskit-derive/src/lib.rs b/tskit-derive/src/lib.rs
index 1c4e2bdb..88e48c57 100644
--- a/tskit-derive/src/lib.rs
+++ b/tskit-derive/src/lib.rs
@@ -55,7 +55,7 @@ fn impl_metadata_roundtrip_macro(ast: &syn::DeriveInput) -> Result<TokenStream,
     let attrs = &ast.attrs;
 
     for attr in attrs.iter() {
-        if attr.path.is_ident("serializer") {
+        if attr.path().is_ident("serializer") {
             let lit: syn::LitStr = attr.parse_args().unwrap();
             let serializer = lit.value();
 
@@ -67,7 +67,7 @@ fn impl_metadata_roundtrip_macro(ast: &syn::DeriveInput) -> Result<TokenStream,
                 proc_macro_error2::abort!(serializer, "is not a supported protocol.");
             }
         } else {
-            proc_macro_error2::abort!(attr.path, "is not a supported attribute.");
+            proc_macro_error2::abort!(attr.path(), "is not a supported attribute.");
         }
     }