Fix warning about Cargo.toml exclude/include

    warning: both package.include and package.exclude are specified; the exclude list will be ignored

Cargo.toml

@@ -6,10 +6,8 @@ categories = ["development-tools::procedural-macro-helpers", "parser-implementat
 description = "Parser for Rust source code"
 documentation = "https://docs.rs/syn"
 edition = "2021"
-exclude = ["build.rs"]
 include = [
     "/benches/**",
-    "/build.rs",
     "/Cargo.toml",
     "/LICENSE-APACHE",
     "/LICENSE-MIT",

build.rs

@@ -15,7 +15,7 @@ fn main() {
         None => return,
     };
 
-    // Note: remove exclude=["build.rs"] from Cargo.toml if adding any
+    // Note: add "/build.rs" to package.include in Cargo.toml if adding any
     // conditional compilation within the library.
     let _ = compiler.minor;