Merge pull request #1635 from dtolnay/checkcfg

Resolve unexpected_cfgs warning
dtolnay · May 7, 2024 · 884ac0c · 884ac0c
2 parents 45844d8 + 05c4cd2
commit 884ac0c
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diff --git a/build.rs b/build.rs
@@ -14,6 +14,12 @@ fn main() {
     // Note: add "/build.rs" to package.include in Cargo.toml if adding any
     // conditional compilation within the library.
 
+    println!("cargo:rustc-cfg=check_cfg");
+    println!("cargo:rustc-check-cfg=cfg(check_cfg)");
+    println!("cargo:rustc-check-cfg=cfg(doc_cfg)");
+    println!("cargo:rustc-check-cfg=cfg(syn_disable_nightly_tests)");
+    println!("cargo:rustc-check-cfg=cfg(syn_only)");
+
     if !unstable() {
         println!("cargo:rustc-cfg=syn_disable_nightly_tests");
     }

diff --git a/src/lib.rs b/src/lib.rs
@@ -253,6 +253,7 @@
 #![cfg_attr(doc_cfg, feature(doc_cfg))]
 #![deny(unsafe_op_in_unsafe_fn)]
 #![allow(non_camel_case_types)]
+#![cfg_attr(not(check_cfg), allow(unexpected_cfgs))]
 #![allow(
     clippy::bool_to_int_with_if,
     clippy::cast_lossless,