Update syn to use "use bound"

Cargo.toml

@@ -2,7 +2,7 @@
 name = "auto_enums"
 version = "0.8.6" #publish:version
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.61"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/taiki-e/auto_enums"
 keywords = ["enum", "macros", "derive", "attribute"]
@@ -84,7 +84,7 @@ trusted_len = []
 derive_utils = "0.14.1"
 proc-macro2 = "1.0.60"
 quote = "1.0.25"
-syn = { version = "2.0.1", default-features = false, features = ["parsing", "printing", "clone-impls", "proc-macro", "full", "visit-mut"] }
+syn = { version = "2.0.91", default-features = false, features = ["parsing", "printing", "clone-impls", "proc-macro", "full", "visit-mut"] }
 
 [dev-dependencies]
 macrotest = { git = "https://github.com/taiki-e/macrotest.git", branch = "dev" } # adjust overwrite behavior + no cargo-expand

tests/type_analysis.rs

@@ -68,6 +68,18 @@ fn func() {
             x -= 1;
         }
     }
+
+    enum A<'a>{
+        First(&'a i32),
+        Second(i32),
+    }
+    #[auto_enum]
+    fn use_bound(x: &i32) -> impl Iterator<Item = A> + use<'_> {
+        match x {
+            0 => vec![x].into_iter().map(|y| A::First(&y)),
+            _ => vec![5, 10].into_iter().map(|y| A::Second(y)),
+        }
+    }
 }
 
 #[test]