5 files changed, 11 insertions, 6 deletions
diff --git a/compiler/rustc_error_codes/src/error_codes.rs b/compiler/rustc_error_codes/src/error_codes.rs
index 6680e8875..1028d43f9 100644
--- a/compiler/rustc_error_codes/src/error_codes.rs
+++ b/compiler/rustc_error_codes/src/error_codes.rs
@@ -653,3 +653,4 @@ E0795: include_str!("./error_codes/E0795.md"),
 //  E0721, // `await` keyword
 //  E0723, // unstable feature in `const` context
 //  E0738, // Removed; errored on `#[track_caller] fn`s in `extern "Rust" { ... }`.
+//  E0744, // merged into E0728
diff --git a/compiler/rustc_error_codes/src/error_codes/E0705.md b/compiler/rustc_error_codes/src/error_codes/E0705.md
index eb76d1836..317f3a47e 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0705.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0705.md
@@ -1,9 +1,11 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 A `#![feature]` attribute was declared for a feature that is stable in the
 current edition, but not in all editions.
 
 Erroneous code example:
 
-```rust2018,compile_fail,E0705
+```compile_fail
 #![feature(rust_2018_preview)]
 #![feature(test_2018_feature)] // error: the feature
                                // `test_2018_feature` is
diff --git a/compiler/rustc_error_codes/src/error_codes/E0744.md b/compiler/rustc_error_codes/src/error_codes/E0744.md
index 9a8ef3b84..e56c45db1 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0744.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0744.md
@@ -1,8 +1,10 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 An unsupported expression was used inside a const context.
 
 Erroneous code example:
 
-```compile_fail,edition2018,E0744
+```ignore (removed error code)
 const _: i32 = {
     async { 0 }.await
 };
diff --git a/compiler/rustc_error_codes/src/error_codes/E0761.md b/compiler/rustc_error_codes/src/error_codes/E0761.md
index 760c58976..975f967d0 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0761.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0761.md
@@ -15,7 +15,7 @@ fn foo() {}
 
 mod ambiguous_module; // error: file for module `ambiguous_module`
                       // found at both ambiguous_module.rs and
-                      // ambiguous_module.rs/mod.rs
+                      // ambiguous_module/mod.rs
 ```
 
 Please remove this ambiguity by deleting/renaming one of the candidate files.
diff --git a/compiler/rustc_error_codes/src/lib.rs b/compiler/rustc_error_codes/src/lib.rs
index 81ad66128..dd2818116 100644
--- a/compiler/rustc_error_codes/src/lib.rs
+++ b/compiler/rustc_error_codes/src/lib.rs
@@ -1,6 +1,6 @@
-#![cfg_attr(not(bootstrap), allow(internal_features))]
-#![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
-#![cfg_attr(not(bootstrap), doc(rust_logo))]
+#![allow(internal_features)]
+#![feature(rustdoc_internals)]
+#![doc(rust_logo)]
 #![deny(rustdoc::invalid_codeblock_attributes)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]