Rollup merge of #156697 - JaafarTanoukhi:iobufreader-stdinlock-diag-items, r=mejrs

Add diagnostic items for IoBufReader and StdinLock

Added two new diagnostic items for IoBufReader and StdinLock.

Author: JonathanBrouwer

compiler/rustc_span/src/symbol.rs

@@ -237,6 +237,7 @@ symbols! {
         IntoFuture,
         IntoIterator,
         IntoIteratorItem,
+        IoBufReader,
         IrTyKind,
         Item,
         ItemContext,
@@ -306,6 +307,7 @@ symbols! {
         Some,
         Source,
         SpanCtxt,
+        StdinLock,
         Str,
         String,
         Struct,

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

@@ -48,6 +48,7 @@ use crate::io::{
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "IoBufReader")]
 pub struct BufReader<R: ?Sized> {
     buf: Buffer,
     inner: R,

library/std/src/io/stdio.rs

@@ -285,6 +285,7 @@ pub struct Stdin {
 /// ```
 #[must_use = "if unused stdin will immediately unlock"]
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "StdinLock")]
 pub struct StdinLock<'a> {
     inner: MutexGuard<'a, BufReader<StdinRaw>>,
 }