diff --git a/Cargo.toml b/Cargo.toml
index aede021f..081541b9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,3 +23,8 @@ serde_json = "1.0.64"
 
 [dev-dependencies]
 quickcheck = "1.0"
+
+[package.metadata.rust-analyzer]
+# This crate uses `#![feature(rustc_private)]`
+# cf. https://github.com/rust-analyzer/rust-analyzer/pull/7891
+rustc_private = true