support older versions of rust
@@ -2009,7 +2009,7 @@ impl UnstableFeature {
pub fn to_env_name(&self) -> String {
let mut feature = serde_json::to_string(&self).unwrap();
feature = feature.replace("\"", "");
- format!("CARGO_MAKE_UNSTABLE_FEATURE_{feature}")
+ format!("CARGO_MAKE_UNSTABLE_FEATURE_{feature}", feature = feature)
}
/// Is the corresponding env. variable set?
