Print unstable option's name on warning
@@ -363,8 +363,8 @@ macro_rules! create_config {
self.$i.1 = true;
self.$i.2 = val;
} else {
- println!("Warning: can't set some features as unstable \
- features are only available in nightly channel.");
+ println!("Warning: can't set `{} = {:?}`, unstable features are only \
+ available in nightly channel.", stringify!($i), val);
}
}
}
