Removed [inline] and copied over comments from Arc::new_cyclic
Removed [inline] and copied over comments from Arc::new_cyclic

aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust