remove support for the #[start] attribute

4 files changed, 10 insertions, 67 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes/E0132.md b/compiler/rustc_error_codes/src/error_codes/E0132.md
index 51258739b89..cbb14510ed7 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0132.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0132.md
@@ -1,32 +1,3 @@
-A function with the `start` attribute was declared with type parameters.
-
-Erroneous code example:
-
-```compile_fail,E0132
-#![feature(start)]
-
-#[start]
-fn f<T>() {}
-```
-
-It is not possible to declare type parameters on a function that has the `start`
-attribute. Such a function must have the following type signature (for more
-information, view [the unstable book][1]):
+#### Note: this error code is no longer emitted by the compiler.
 
-[1]: https://doc.rust-lang.org/unstable-book/language-features/start.html
-
-```
-# let _:
-fn(isize, *const *const u8) -> isize;
-```
-
-Example:
-
-```
-#![feature(start)]
-
-#[start]
-fn my_start(argc: isize, argv: *const *const u8) -> isize {
-    0
-}
-```
+A function with the `start` attribute was declared with type parameters.
diff --git a/compiler/rustc_error_codes/src/error_codes/E0138.md b/compiler/rustc_error_codes/src/error_codes/E0138.md
index 3f5eaea9f98..2e6ba546a16 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0138.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0138.md
@@ -1,25 +1,3 @@
-More than one function was declared with the `#[start]` attribute.
-
-Erroneous code example:
-
-```compile_fail,E0138
-#![feature(start)]
-
-#[start]
-fn foo(argc: isize, argv: *const *const u8) -> isize {}
+#### Note: this error code is no longer emitted by the compiler.
 
-#[start]
-fn f(argc: isize, argv: *const *const u8) -> isize {}
-// error: multiple 'start' functions
-```
-
-This error indicates that the compiler found multiple functions with the
-`#[start]` attribute. This is an error because there must be a unique entry
-point into a Rust program. Example:
-
-```
-#![feature(start)]
-
-#[start]
-fn foo(argc: isize, argv: *const *const u8) -> isize { 0 } // ok!
-```
+More than one function was declared with the `#[start]` attribute.
diff --git a/compiler/rustc_error_codes/src/error_codes/E0647.md b/compiler/rustc_error_codes/src/error_codes/E0647.md
index 59bb47ba62a..e2f14b81aa6 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0647.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0647.md
@@ -1,13 +1,3 @@
-The `start` function was defined with a where clause.
-
-Erroneous code example:
+#### Note: this error code is no longer emitted by the compiler.
 
-```compile_fail,E0647
-#![feature(start)]
-
-#[start]
-fn start(_: isize, _: *const *const u8) -> isize where (): Copy {
-    //^ error: `#[start]` function is not allowed to have a where clause
-    0
-}
-```
+The `start` function was defined with a where clause.
diff --git a/compiler/rustc_error_codes/src/lib.rs b/compiler/rustc_error_codes/src/lib.rs
index 29f3277d399..0a30bdb48a0 100644
--- a/compiler/rustc_error_codes/src/lib.rs
+++ b/compiler/rustc_error_codes/src/lib.rs
@@ -24,6 +24,10 @@
 //
 // Both columns are necessary because it's not possible in Rust to create a new identifier such as
 // `E0123` from an integer literal such as `0123`, unfortunately.
+//
+// Do *not* remove entries from this list. Instead, just add a note th the corresponding markdown
+// file saying that this error is not emitted by the compiler any more (see E0001.md for an
+// example), and remove all code examples that do not build any more.
 #[macro_export]
 macro_rules! error_codes {
     ($macro:path) => (