Rollup merge of #68365 - GuillaumeGomez:clean-up-err-codes-2, r=Dylan-DPC
Clean up error codes
r? @Dylan-DPC
diff --git a/src/librustc_error_codes/error_codes/E0201.md b/src/librustc_error_codes/error_codes/E0201.md
index bdbf02f..0e1a7b7 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 3156901..96e4475 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,
}
