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`

3 files changed, 74 insertions, 0 deletions

diff --git a/tests/run-coverage/auxiliary/macro_name_span_helper.rs b/tests/run-coverage/auxiliary/macro_name_span_helper.rs
new file mode 100644
index 00000000000..6797c081d93
--- /dev/null
+++ b/tests/run-coverage/auxiliary/macro_name_span_helper.rs
@@ -0,0 +1,10 @@
+// edition: 2021
+
+#[macro_export]
+macro_rules! macro_that_defines_a_function {
+    (fn $name:ident () $body:tt) => {
+        fn $name () -> () $body
+    }
+}
+
+// Non-executable comment.
diff --git a/tests/run-coverage/macro_name_span.coverage b/tests/run-coverage/macro_name_span.coverage
new file mode 100644
index 00000000000..cadf7024657
--- /dev/null
+++ b/tests/run-coverage/macro_name_span.coverage
@@ -0,0 +1,39 @@
+$DIR/auxiliary/macro_name_span_helper.rs:
+   LL|       |// edition: 2021
+   LL|       |
+   LL|       |#[macro_export]
+   LL|       |macro_rules! macro_that_defines_a_function {
+   LL|       |    (fn $name:ident () $body:tt) => {
+   LL|      1|        fn $name () -> () $body
+   LL|       |    }
+   LL|       |}
+   LL|       |
+   LL|       |// Non-executable comment.
+
+$DIR/macro_name_span.rs:
+   LL|       |// edition: 2021
+   LL|       |
+   LL|       |// Regression test for <https://github.com/rust-lang/rust/issues/117788>.
+   LL|       |// Under some circumstances, the heuristics that detect macro name spans can
+   LL|       |// get confused and produce incorrect spans beyond the bounds of the span
+   LL|       |// being processed.
+   LL|       |
+   LL|       |// aux-build: macro_name_span_helper.rs
+   LL|       |extern crate macro_name_span_helper;
+   LL|       |
+   LL|      1|fn main() {
+   LL|      1|    affected_function();
+   LL|      1|}
+   LL|       |
+   LL|       |macro_rules! macro_with_an_unreasonably_and_egregiously_long_name {
+   LL|       |    () => {
+   LL|       |        println!("hello");
+   LL|       |    };
+   LL|       |}
+   LL|       |
+   LL|       |macro_name_span_helper::macro_that_defines_a_function! {
+   LL|       |    fn affected_function() {
+   LL|       |        macro_with_an_unreasonably_and_egregiously_long_name!();
+   LL|       |    }
+   LL|       |}
+
diff --git a/tests/run-coverage/macro_name_span.rs b/tests/run-coverage/macro_name_span.rs
new file mode 100644
index 00000000000..5d15977c498
--- /dev/null
+++ b/tests/run-coverage/macro_name_span.rs
@@ -0,0 +1,25 @@
+// edition: 2021
+
+// Regression test for <https://github.com/rust-lang/rust/issues/117788>.
+// Under some circumstances, the heuristics that detect macro name spans can
+// get confused and produce incorrect spans beyond the bounds of the span
+// being processed.
+
+// aux-build: macro_name_span_helper.rs
+extern crate macro_name_span_helper;
+
+fn main() {
+    affected_function();
+}
+
+macro_rules! macro_with_an_unreasonably_and_egregiously_long_name {
+    () => {
+        println!("hello");
+    };
+}
+
+macro_name_span_helper::macro_that_defines_a_function! {
+    fn affected_function() {
+        macro_with_an_unreasonably_and_egregiously_long_name!();
+    }
+}