3 files changed, 7 insertions, 3 deletions
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.