Add tracking issue number to wasi_ext

Author: a1phyr

library/std/src/os/wasi/fs.rs

@@ -1,7 +1,7 @@
 //! WASI-specific extensions to primitives in the `std::fs` module.
 
 #![deny(unsafe_op_in_unsafe_fn)]
-#![unstable(feature = "wasi_ext", issue = "none")]
+#![unstable(feature = "wasi_ext", issue = "71213")]
 
 use crate::ffi::OsStr;
 use crate::fs::{self, File, Metadata, OpenOptions};

library/std/src/os/wasi/io.rs

@@ -1,7 +1,7 @@
 //! WASI-specific extensions to general I/O primitives
 
 #![deny(unsafe_op_in_unsafe_fn)]
-#![unstable(feature = "wasi_ext", issue = "none")]
+#![unstable(feature = "wasi_ext", issue = "71213")]
 
 use crate::fs;
 use crate::io;