Auto merge of #117843 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum 1.74.0

[stable] Prepare 1.74.0 release

https://forge.rust-lang.org/release/process.html#promote-branches-t-3-days-monday

Also backports:

* Disabling specialization as an alternative backport of "Fix excessive initialization and reads beyond EOF in io::copy(_, Vec<u8>) specialization #117576"
*  coverage: Avoid creating malformed macro name spans #117827

r? `@Mark-Simulacrum`

1 files changed, 0 insertions, 12 deletions

diff --git a/library/std/src/io/copy/tests.rs b/library/std/src/io/copy/tests.rs
index af137eaf856..d9998e87c66 100644
--- a/library/std/src/io/copy/tests.rs
+++ b/library/std/src/io/copy/tests.rs
@@ -81,18 +81,6 @@ fn copy_specializes_bufreader() {
 }
 
 #[test]
-fn copy_specializes_to_vec() {
-    let cap = 123456;
-    let mut source = ShortReader { cap, observed_buffer: 0, read_size: 1337 };
-    let mut sink = Vec::new();
-    assert_eq!(cap as u64, io::copy(&mut source, &mut sink).unwrap());
-    assert!(
-        source.observed_buffer > DEFAULT_BUF_SIZE,
-        "expected a large buffer to be provided to the reader"
-    );
-}
-
-#[test]
 fn copy_specializes_from_vecdeque() {
     let mut source = VecDeque::with_capacity(100 * 1024);
     for _ in 0..20 * 1024 {