Add rust-version metadata

dtolnay · dtolnay · commit 77e56b5ab7de · 2025-12-13T22:58:01.000-08:00
diff --git a/json/Cargo.toml b/json/Cargo.toml
@@ -9,6 +9,7 @@ edition = "2021"
 keywords = ["syn"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/syn"
+rust-version = "1.82"
 
 [features]
 default = ["serde"]
