Auto merge of rust-lang#145601 - jieyouxu:rollup-t5mbqhc, r=jieyouxu

Rollup of 10 pull requests

Successful merges:

 - rust-lang#145538 (bufreader::Buffer::backshift: don't move the uninit bytes)
 - rust-lang#145542 (triagebot: Don't warn no-mentions on subtree updates)
 - rust-lang#145549 (Update rust maintainers in openharmony.md)
 - rust-lang#145550 (Avoid using `()` in `derive(From)` output.)
 - rust-lang#145556 (Allow stability attributes on extern crates)
 - rust-lang#145560 (Remove unused `PartialOrd`/`Ord` from bootstrap)
 - rust-lang#145568 (ignore frontmatters in `TokenStream::new`)
 - rust-lang#145571 (remove myself from some adhoc-groups and pings)
 - rust-lang#145576 (Add change tracker entry for `--timings`)
 - rust-lang#145578 (Add VEXos "linked files" support to `armv7a-vex-v5`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

std/src/io/buffered/bufreader/buffer.rs

@@ -122,7 +122,7 @@ impl Buffer {
 
     /// Remove bytes that have already been read from the buffer.
     pub fn backshift(&mut self) {
-        self.buf.copy_within(self.pos.., 0);
+        self.buf.copy_within(self.pos..self.filled, 0);
         self.filled -= self.pos;
         self.pos = 0;
     }