add a note of rust-lang/rust/#31439 to the wiki text
add a note of rust-lang/rust/#31439 to the wiki text

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