Auto merge of #88824 - Manishearth:rollup-7bzk9h6, r=Manishearth

Rollup of 15 pull requests

Successful merges:

 - #85200 (Ignore derived Clone and Debug implementations during dead code analysis)
 - #86165 (Add proc_macro::Span::{before, after}.)
 - #87088 (Fix stray notes when the source code is not available)
 - #87441 (Emit suggestion when passing byte literal to format macro)
 - #88546 (Emit proper errors when on missing closure braces)
 - #88578 (fix(rustc): suggest `items` be borrowed in `for i in items[x..]`)
 - #88632 (Fix issues with Markdown summary options)
 - #88639 (rustdoc: Fix ICE with `doc(hidden)` on tuple variant fields)
 - #88667 (Tweak `write_fmt` doc.)
 - #88720 (Rustdoc coverage fields count)
 - #88732 (RustWrapper: avoid deleted unclear attribute methods)
 - #88742 (Fix table in docblocks)
 - #88776 (Workaround blink/chromium grid layout limitation of 1000 rows)
 - #88807 (Fix typo in docs for iterators)
 - #88812 (Fix typo `option` -> `options`.)

Failed merges:

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

1 files changed, 45 insertions, 0 deletions

diff --git a/src/test/ui/derives/clone-debug-dead-code.rs b/src/test/ui/derives/clone-debug-dead-code.rs
new file mode 100644
index 00000000000..80e91320939
--- /dev/null
+++ b/src/test/ui/derives/clone-debug-dead-code.rs
@@ -0,0 +1,45 @@
+// Checks that derived implementations of Clone and Debug do not
+// contribute to dead code analysis (issue #84647).
+
+#![forbid(dead_code)]
+
+struct A { f: () }
+//~^ ERROR: field is never read: `f`
+
+#[derive(Clone)]
+struct B { f: () }
+//~^ ERROR: field is never read: `f`
+
+#[derive(Debug)]
+struct C { f: () }
+//~^ ERROR: field is never read: `f`
+
+#[derive(Debug,Clone)]
+struct D { f: () }
+//~^ ERROR: field is never read: `f`
+
+struct E { f: () }
+//~^ ERROR: field is never read: `f`
+// Custom impl, still doesn't read f
+impl Clone for E {
+    fn clone(&self) -> Self {
+        Self { f: () }
+    }
+}
+
+struct F { f: () }
+// Custom impl that actually reads f
+impl Clone for F {
+    fn clone(&self) -> Self {
+        Self { f: self.f }
+    }
+}
+
+fn main() {
+    let _ = A { f: () };
+    let _ = B { f: () };
+    let _ = C { f: () };
+    let _ = D { f: () };
+    let _ = E { f: () };
+    let _ = F { f: () };
+}