Auto merge of #64932 - tmandry:rollup-7t8x1nz, r=tmandry

Rollup of 9 pull requests

Successful merges:

 - #64377 (Add long error explanation for E0493)
 - #64786 (Use https for curl when building for linux)
 - #64828 (Graphviz debug output for generic dataflow analysis)
 - #64838 (Add long error explanation for E0550)
 - #64891 (Fix `vec![x; n]` with null raw fat pointer zeroing the pointer metadata)
 - #64893 (Zero-initialize `vec![None; n]` for `Option<&T>`, `Option<&mut T>` and `Option<Box<T>>`)
 - #64911 (Fixed a misleading documentation issue #64844)
 - #64921 (Add test for issue-64662)
 - #64923 (Add missing links for mem::needs_drop)

Failed merges:

 - #64918 (Add long error explanation for E0551)

r? @ghost

1 files changed, 19 insertions, 1 deletions

diff --git a/src/libsyntax/error_codes.rs b/src/libsyntax/error_codes.rs
index 9925dd8ada0..8a78daee6e4 100644
--- a/src/libsyntax/error_codes.rs
+++ b/src/libsyntax/error_codes.rs
@@ -144,6 +144,25 @@ fn deprecated_function() {}
 ```
 "##,
 
+E0550: r##"
+More than one `deprecated` attribute has been put on an item.
+
+Erroneous code example:
+
+```compile_fail,E0550
+#[deprecated(note = "because why not?")]
+#[deprecated(note = "right?")] // error!
+fn the_banished() {}
+```
+
+The `deprecated` attribute can only be present **once** on an item.
+
+```
+#[deprecated(note = "because why not, right?")]
+fn the_banished() {} // ok!
+```
+"##,
+
 E0552: r##"
 A unrecognized representation attribute was used.
 
@@ -435,7 +454,6 @@ features in the `-Z allow_features` flag.
     // rustc_deprecated attribute must be paired with either stable or unstable
     // attribute
     E0549,
-    E0550, // multiple deprecated attributes
     E0551, // incorrect meta item
     E0553, // multiple rustc_const_unstable attributes
 //  E0555, // replaced with a generic attribute input check