Auto merge of #68380 - Dylan-DPC:rollup-a7moqmr, r=Dylan-DPC

Rollup of 5 pull requests

Successful merges:

 - #68326 (rustdoc: Catch fatal errors when syntax highlighting)
 - #68335 (Remove real_drop_in_place)
 - #68353 (Remove `rustc_error_codes` deps except in `rustc_driver`)
 - #68357 (rustdoc: Fix handling of compile errors when running `rustdoc --test`)
 - #68365 (Clean up error codes)

Failed merges:

r? @ghost

2 files changed, 13 insertions, 10 deletions

diff --git a/src/librustc_error_codes/error_codes/E0201.md b/src/librustc_error_codes/error_codes/E0201.md
index bdbf02f0033..0e1a7b7b7de 100644
--- a/src/librustc_error_codes/error_codes/E0201.md
+++ b/src/librustc_error_codes/error_codes/E0201.md
@@ -1,7 +1,7 @@
-It is an error to define two associated items (like methods, associated types,
-associated functions, etc.) with the same identifier.
+Two associated items (like methods, associated types, associated functions,
+etc.) were defined with the same identifier.
 
-For example:
+Erroneous code example:
 
 ```compile_fail,E0201
 struct Foo(u8);
diff --git a/src/librustc_error_codes/error_codes/E0204.md b/src/librustc_error_codes/error_codes/E0204.md
index 31569011135..96e44758be4 100644
--- a/src/librustc_error_codes/error_codes/E0204.md
+++ b/src/librustc_error_codes/error_codes/E0204.md
@@ -1,21 +1,24 @@
-An attempt to implement the `Copy` trait for a struct failed because one of the
-fields does not implement `Copy`. To fix this, you must implement `Copy` for the
-mentioned field. Note that this may not be possible, as in the example of
+The `Copy` trait was implemented on a type which contains a field that doesn't
+implement the `Copy` trait.
+
+Erroneous code example:
 
 ```compile_fail,E0204
 struct Foo {
-    foo : Vec<u32>,
+    foo: Vec<u32>,
 }
 
-impl Copy for Foo { }
+impl Copy for Foo { } // error!
 ```
 
-This fails because `Vec<T>` does not implement `Copy` for any `T`.
+The `Copy` trait is implemented by default only on primitive types. If your
+type only contains primitive types, you'll be able to implement `Copy` on it.
+Otherwise, it won't be possible.
 
 Here's another example that will fail:
 
 ```compile_fail,E0204
-#[derive(Copy)]
+#[derive(Copy)] // error!
 struct Foo<'a> {
     ty: &'a mut bool,
 }