Auto merge of #65570 - tmandry:rollup-hck39pf, r=tmandry

Rollup of 19 pull requests

Successful merges:

 - #65016 (Always inline `mem::{size_of,align_of}` in debug builds)
 - #65197 (Prepare `MutVisitor`s to handle interned projections)
 - #65201 (Disable Go and OCaml bindings when building LLVM)
 - #65334 (Add long error explanation for E0575)
 - #65364 (Collect occurrences of empty blocks for mismatched braces diagnostic)
 - #65455 (Avoid unnecessary `TokenTree` to `TokenStream` conversions)
 - #65472 (Use a sharded dep node to dep node index map)
 - #65480 (Speed up `LexicalResolve::expansion()`)
 - #65493 (Add long error explanation for E0584)
 - #65496 (properly document panics in div_euclid and rem_euclid)
 - #65498 (Plugins deprecation: don’t suggest simply removing the attribute)
 - #65508 (add option to ping llvm ice-breakers to triagebot)
 - #65511 (save-analysis: Nest tables when processing impl block definitions)
 - #65513 (reorder fmt docs for more clarity)
 - #65532 (doc: make BitSet intro more short)
 - #65535 (rustc: arena-allocate the slice in `ty::GenericsPredicate`, not the whole struct.)
 - #65540 (show up some extra info when t!() fails)
 - #65549 (Fix left/right shift typo in wrapping rotate docs)
 - #65552 (Clarify diagnostics when using `~` as a unary op)

Failed merges:

 - #65390 (Add long error explanation for E0576)
 - #65434 (Add long error explanation for E0577)
 - #65471 (Add long error explanation for E0578)

r? @ghost

1 files changed, 27 insertions, 1 deletions

diff --git a/src/libsyntax/error_codes.rs b/src/libsyntax/error_codes.rs
index fc3f095856a..17ea4767520 100644
--- a/src/libsyntax/error_codes.rs
+++ b/src/libsyntax/error_codes.rs
@@ -295,6 +295,33 @@ named `file_that_doesnt_exist.rs` or `file_that_doesnt_exist/mod.rs` in the
 same directory.
 "##,
 
+E0584: r##"
+A doc comment that is not attached to anything has been encountered.
+
+Erroneous code example:
+
+```compile_fail,E0584
+trait Island {
+    fn lost();
+
+    /// I'm lost!
+}
+```
+
+A little reminder: a doc comment has to be placed before the item it's supposed
+to document. So if you want to document the `Island` trait, you need to put a
+doc comment before it, not inside it. Same goes for the `lost` method: the doc
+comment needs to be before it:
+
+```
+/// I'm THE island!
+trait Island {
+    /// I'm lost!
+    fn lost();
+}
+```
+"##,
+
 E0585: r##"
 A documentation comment that doesn't document anything was found.
 
@@ -494,7 +521,6 @@ features in the `-Z allow_features` flag.
     E0549,
     E0553, // multiple rustc_const_unstable attributes
 //  E0555, // replaced with a generic attribute input check
-    E0584, // file for module `..` found at both .. and ..
     E0629, // missing 'feature' (rustc_const_unstable)
     // rustc_const_unstable attribute must be paired with stable/unstable
     // attribute