Auto merge of #70371 - Centril:rollup-ywi1vo3, r=Centril

Rollup of 8 pull requests

Successful merges:

 - #70023 (clean up E0436 explanation)
 - #70234 (#[track_caller] on core::ops::{Index, IndexMut}.)
 - #70241 (Miri: move ModifiedStatic to ConstEval errors)
 - #70342 (IoSlice/IoSliceMut should be Send and Sync)
 - #70350 (Request "-Z unstable-options" for unstable options)
 - #70355 (Clean up E0454)
 - #70359 (must_use on split_off)
 - #70368 (Mark hotplug_codegen_backend as ignore-stage1)

Failed merges:

r? @ghost

2 files changed, 7 insertions, 4 deletions

diff --git a/src/librustc_error_codes/error_codes/E0436.md b/src/librustc_error_codes/error_codes/E0436.md
index b1afd9e9603..48ecc49e92f 100644
--- a/src/librustc_error_codes/error_codes/E0436.md
+++ b/src/librustc_error_codes/error_codes/E0436.md
@@ -1,5 +1,4 @@
-The functional record update syntax is only allowed for structs. (Struct-like
-enum variants don't qualify, for example.)
+The functional record update syntax was used on something other than a struct.
 
 Erroneous code example:
 
@@ -24,7 +23,9 @@ fn one_up_competitor(competitor_frequency: PublicationFrequency)
 }
 ```
 
-Rewrite the expression without functional record update syntax:
+The functional record update syntax is only allowed for structs (struct-like
+enum variants don't qualify, for example). To fix the previous code, rewrite the
+expression without functional record update syntax:
 
 ```
 enum PublicationFrequency {
diff --git a/src/librustc_error_codes/error_codes/E0454.md b/src/librustc_error_codes/error_codes/E0454.md
index 80eb91e43d1..23ca6c7824d 100644
--- a/src/librustc_error_codes/error_codes/E0454.md
+++ b/src/librustc_error_codes/error_codes/E0454.md
@@ -1,4 +1,6 @@
-A link name was given with an empty name. Erroneous code example:
+A link name was given with an empty name.
+
+Erroneous code example:
 
 ```compile_fail,E0454
 #[link(name = "")] extern {}