remove unneccessary wrapping of return value of allow_unstable(), it would always return Some(thing)
remove unneccessary wrapping of return value of allow_unstable(), it would always return Some(thing)

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