Retire error code.

diff --git a/compiler/rustc_error_codes/src/error_codes/E0760.md b/compiler/rustc_error_codes/src/error_codes/E0760.md
index e1dcfefebcd762187aba9a1d49a0b44154696787..85e5faada224e4269622c711e59a4ff836bbcf17 100644 (file)
--- a/compiler/rustc_error_codes/src/error_codes/E0760.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0760.md
@@ -1,9 +1,11 @@
+#### Note: this error code is no longer emitted by the compiler.
+
 `async fn`/`impl trait` return type cannot contain a projection
 or `Self` that references lifetimes from a parent scope.
 
 Erroneous code example:
 
-```compile_fail,E0760,edition2018
+```compile_fail,edition2018
 struct S<'a>(&'a i32);
 
 impl<'a> S<'a> {