From 1ab9fe5d44860050232438967bbbf9bdc35dbde1 Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Wed, 17 Feb 2021 13:33:47 +0100
Subject: [PATCH 1/5] Add {core,std}::prelude::{rust_2015,rust_2018,rust_2021}.

rust_2015 and rust_2018 are just re-exports of v1.
rust_2021 is a module that for now just re-exports everything from v1,
such that we can add more things later.
---
 library/core/src/prelude/mod.rs | 36 +++++++++++++++++++++++++++++++++
 library/core/src/prelude/v1.rs  |  6 ++----
 library/std/src/lib.rs          |  1 +
 library/std/src/prelude/mod.rs  | 34 +++++++++++++++++++++++++++++++
 4 files changed, 73 insertions(+), 4 deletions(-)

diff --git a/library/core/src/prelude/mod.rs b/library/core/src/prelude/mod.rs
index 51f4acf068580..1cb65eabb9a62 100644
--- a/library/core/src/prelude/mod.rs
+++ b/library/core/src/prelude/mod.rs
@@ -1,5 +1,41 @@
 //! The libcore prelude
+//!
+//! This module is intended for users of libcore which do not link to libstd as
+//! well. This module is imported by default when `#![no_std]` is used in the
+//! same manner as the standard library's prelude.
 
 #![stable(feature = "core_prelude", since = "1.4.0")]
 
 pub mod v1;
+
+/// The 2015 version of the core prelude.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2015", issue = "none")]
+pub mod rust_2015 {
+    #[unstable(feature = "prelude_2015", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2018 version of the core prelude.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2018", issue = "none")]
+pub mod rust_2018 {
+    #[unstable(feature = "prelude_2018", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2021 version of the core prelude.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2021", issue = "none")]
+pub mod rust_2021 {
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+
+    // FIXME: Add more things.
+}
diff --git a/library/core/src/prelude/v1.rs b/library/core/src/prelude/v1.rs
index a1fbd8dec7505..993281fe88247 100644
--- a/library/core/src/prelude/v1.rs
+++ b/library/core/src/prelude/v1.rs
@@ -1,8 +1,6 @@
-//! The core prelude
+//! The first version of the core prelude.
 //!
-//! This module is intended for users of libcore which do not link to libstd as
-//! well. This module is imported by default when `#![no_std]` is used in the
-//! same manner as the standard library's prelude.
+//! See the [module-level documentation](../index.html) for more.
 
 #![stable(feature = "core_prelude", since = "1.4.0")]
 
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 588bffb57c9c5..de816bdfef04e 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -299,6 +299,7 @@
 #![feature(panic_internals)]
 #![feature(panic_unwind)]
 #![feature(pin_static_ref)]
+#![feature(prelude_2021)]
 #![feature(prelude_import)]
 #![feature(ptr_internals)]
 #![feature(raw)]
diff --git a/library/std/src/prelude/mod.rs b/library/std/src/prelude/mod.rs
index eb2095b819657..bb45aed90e7f4 100644
--- a/library/std/src/prelude/mod.rs
+++ b/library/std/src/prelude/mod.rs
@@ -84,3 +84,37 @@
 #![stable(feature = "rust1", since = "1.0.0")]
 
 pub mod v1;
+
+/// The 2015 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2015", issue = "none")]
+pub mod rust_2015 {
+    #[unstable(feature = "prelude_2015", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2018 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2018", issue = "none")]
+pub mod rust_2018 {
+    #[unstable(feature = "prelude_2018", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+}
+
+/// The 2021 version of the prelude of The Rust Standard Library.
+///
+/// See the [module-level documentation](../index.html) for more.
+#[unstable(feature = "prelude_2021", issue = "none")]
+pub mod rust_2021 {
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use super::v1::*;
+
+    #[unstable(feature = "prelude_2021", issue = "none")]
+    #[doc(no_inline)]
+    pub use core::prelude::rust_2021::*;
+}

From d3b564c3d79fd33ea7da3b9b2ea046daacab4467 Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Wed, 17 Feb 2021 13:34:58 +0100
Subject: [PATCH 2/5] Pick the injected prelude based on the edition.

---
 .../src/standard_library_imports.rs           | 30 ++++++++++++-------
 compiler/rustc_span/src/symbol.rs             |  3 ++
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/compiler/rustc_builtin_macros/src/standard_library_imports.rs b/compiler/rustc_builtin_macros/src/standard_library_imports.rs
index 3a81d076dc52f..efda731330721 100644
--- a/compiler/rustc_builtin_macros/src/standard_library_imports.rs
+++ b/compiler/rustc_builtin_macros/src/standard_library_imports.rs
@@ -3,7 +3,7 @@ use rustc_ast::ptr::P;
 use rustc_expand::base::{ExtCtxt, ResolverExpand};
 use rustc_expand::expand::ExpansionConfig;
 use rustc_session::Session;
-use rustc_span::edition::Edition;
+use rustc_span::edition::Edition::*;
 use rustc_span::hygiene::AstPass;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::DUMMY_SP;
@@ -14,7 +14,7 @@ pub fn inject(
     sess: &Session,
     alt_std_name: Option<Symbol>,
 ) -> ast::Crate {
-    let rust_2018 = sess.parse_sess.edition >= Edition::Edition2018;
+    let edition = sess.parse_sess.edition;
 
     // the first name in this list is the crate name of the crate with the prelude
     let names: &[Symbol] = if sess.contains_name(&krate.attrs, sym::no_core) {
@@ -43,7 +43,11 @@ pub fn inject(
 
     // .rev() to preserve ordering above in combination with insert(0, ...)
     for &name in names.iter().rev() {
-        let ident = if rust_2018 { Ident::new(name, span) } else { Ident::new(name, call_site) };
+        let ident = if edition >= Edition2018 {
+            Ident::new(name, span)
+        } else {
+            Ident::new(name, call_site)
+        };
         krate.items.insert(
             0,
             cx.item(
@@ -59,14 +63,18 @@ pub fn inject(
     // the one with the prelude.
     let name = names[0];
 
-    let import_path = if rust_2018 {
-        [name, sym::prelude, sym::v1].iter().map(|symbol| Ident::new(*symbol, span)).collect()
-    } else {
-        [kw::PathRoot, name, sym::prelude, sym::v1]
-            .iter()
-            .map(|symbol| Ident::new(*symbol, span))
-            .collect()
-    };
+    let root = (edition == Edition2015).then(|| kw::PathRoot);
+
+    let import_path = root
+        .iter()
+        .chain(&[name, sym::prelude])
+        .chain(&[match edition {
+            Edition2015 => sym::rust_2015,
+            Edition2018 => sym::rust_2018,
+            Edition2021 => sym::rust_2021,
+        }])
+        .map(|&symbol| Ident::new(symbol, span))
+        .collect();
 
     let use_item = cx.item(
         span,
diff --git a/compiler/rustc_span/src/symbol.rs b/compiler/rustc_span/src/symbol.rs
index b112402ffe371..7b85c964dfd2d 100644
--- a/compiler/rustc_span/src/symbol.rs
+++ b/compiler/rustc_span/src/symbol.rs
@@ -944,8 +944,11 @@ symbols! {
         rt,
         rtm_target_feature,
         rust,
+        rust_2015,
         rust_2015_preview,
+        rust_2018,
         rust_2018_preview,
+        rust_2021,
         rust_2021_preview,
         rust_begin_unwind,
         rust_eh_catch_typeinfo,

From 218cf30c53bbc193d9d2143f91e7379aa01f0aab Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Wed, 17 Feb 2021 15:52:31 +0100
Subject: [PATCH 3/5] Update test output for edition preludes.

---
 src/test/ui/ast-json/ast-json-output.stdout                 | 2 +-
 .../extern-prelude-extern-crate-restricted-shadowing.stderr | 6 +++---
 src/test/ui/issues/issue-27033.stderr                       | 6 +++---
 src/test/ui/issues/issue-60662.stdout                       | 2 +-
 src/test/ui/proc-macro/meta-macro-hygiene.stdout            | 2 +-
 src/test/ui/proc-macro/nonterminal-token-hygiene.stdout     | 2 +-
 src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout  | 2 +-
 7 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/test/ui/ast-json/ast-json-output.stdout b/src/test/ui/ast-json/ast-json-output.stdout
index d26530efe3ecd..535f57bf6af85 100644
--- a/src/test/ui/ast-json/ast-json-output.stdout
+++ b/src/test/ui/ast-json/ast-json-output.stdout
@@ -1 +1 @@
-{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"crate_type","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":{"variant":"Eq","fields":[{"lo":0,"hi":0},{"kind":{"variant":"Interpolated","fields":[{"variant":"NtExpr","fields":[{"id":0,"kind":{"variant":"Lit","fields":[{"token":{"kind":"Str","symbol":"lib","suffix":null},"kind":{"variant":"Str","fields":["lib","Cooked"]},"span":{"lo":0,"hi":0}}]},"span":{"lo":0,"hi":0},"attrs":{"0":null},"tokens":{"0":[[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"Alone"]]}}]}]},"span":{"lo":0,"hi":0}}]},"tokens":null},{"0":[[{"variant":"Token","fields":[{"kind":"Pound","span":{"lo":0,"hi":0}}]},"Joint"],[{"variant":"Token","fields":[{"kind":"Not","span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Delimited","fields":[{"open":{"lo":0,"hi":0},"close":{"lo":0,"hi":0}},"Bracket",{"0":[[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["crate_type",false]},"span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Token","fields":[{"kind":"Eq","span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"Alone"]]}]},"Alone"]]}]},"id":null,"style":"Inner","span":{"lo":0,"hi":0}}],"items":[{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"prelude_import","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":"Empty","tokens":null},null]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Use","fields":[{"prefix":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"{{root}}","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"std","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"prelude","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"v1","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"kind":"Glob","span":{"lo":0,"hi":0}}]},"tokens":null},{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"macro_use","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":"Empty","tokens":null},null]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"std","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null},{"attrs":[],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"core","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null}],"span":{"lo":0,"hi":0},"proc_macros":[]}
+{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"crate_type","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":{"variant":"Eq","fields":[{"lo":0,"hi":0},{"kind":{"variant":"Interpolated","fields":[{"variant":"NtExpr","fields":[{"id":0,"kind":{"variant":"Lit","fields":[{"token":{"kind":"Str","symbol":"lib","suffix":null},"kind":{"variant":"Str","fields":["lib","Cooked"]},"span":{"lo":0,"hi":0}}]},"span":{"lo":0,"hi":0},"attrs":{"0":null},"tokens":{"0":[[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"Alone"]]}}]}]},"span":{"lo":0,"hi":0}}]},"tokens":null},{"0":[[{"variant":"Token","fields":[{"kind":"Pound","span":{"lo":0,"hi":0}}]},"Joint"],[{"variant":"Token","fields":[{"kind":"Not","span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Delimited","fields":[{"open":{"lo":0,"hi":0},"close":{"lo":0,"hi":0}},"Bracket",{"0":[[{"variant":"Token","fields":[{"kind":{"variant":"Ident","fields":["crate_type",false]},"span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Token","fields":[{"kind":"Eq","span":{"lo":0,"hi":0}}]},"Alone"],[{"variant":"Token","fields":[{"kind":{"variant":"Literal","fields":[{"kind":"Str","symbol":"lib","suffix":null}]},"span":{"lo":0,"hi":0}}]},"Alone"]]}]},"Alone"]]}]},"id":null,"style":"Inner","span":{"lo":0,"hi":0}}],"items":[{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"prelude_import","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":"Empty","tokens":null},null]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"","span":{"lo":0,"hi":0}},"kind":{"variant":"Use","fields":[{"prefix":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"{{root}}","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"std","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"prelude","span":{"lo":0,"hi":0}},"id":0,"args":null},{"ident":{"name":"rust_2015","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"kind":"Glob","span":{"lo":0,"hi":0}}]},"tokens":null},{"attrs":[{"kind":{"variant":"Normal","fields":[{"path":{"span":{"lo":0,"hi":0},"segments":[{"ident":{"name":"macro_use","span":{"lo":0,"hi":0}},"id":0,"args":null}],"tokens":null},"args":"Empty","tokens":null},null]},"id":null,"style":"Outer","span":{"lo":0,"hi":0}}],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"std","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null},{"attrs":[],"id":0,"span":{"lo":0,"hi":0},"vis":{"kind":"Inherited","span":{"lo":0,"hi":0},"tokens":null},"ident":{"name":"core","span":{"lo":0,"hi":0}},"kind":{"variant":"ExternCrate","fields":[null]},"tokens":null}],"span":{"lo":0,"hi":0},"proc_macros":[]}
diff --git a/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.stderr b/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.stderr
index 016c48118b3ce..4cda07758527a 100644
--- a/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.stderr
+++ b/src/test/ui/imports/extern-prelude-extern-crate-restricted-shadowing.stderr
@@ -24,10 +24,10 @@ LL |         extern crate std as Vec;
 LL | define_vec!();
    | -------------- in this macro invocation
 note: `Vec` could also refer to the struct defined here
-  --> $SRC_DIR/std/src/prelude/v1.rs:LL:COL
+  --> $SRC_DIR/std/src/prelude/mod.rs:LL:COL
    |
-LL | pub use crate::vec::Vec;
-   |         ^^^^^^^^^^^^^^^
+LL |     pub use super::v1::*;
+   |             ^^^^^^^^^^^^
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: aborting due to 2 previous errors
diff --git a/src/test/ui/issues/issue-27033.stderr b/src/test/ui/issues/issue-27033.stderr
index ad48fc23a386b..fa42611d0b32e 100644
--- a/src/test/ui/issues/issue-27033.stderr
+++ b/src/test/ui/issues/issue-27033.stderr
@@ -4,10 +4,10 @@ error[E0530]: match bindings cannot shadow unit variants
 LL |         None @ _ => {}
    |         ^^^^ cannot be named the same as a unit variant
    | 
-  ::: $SRC_DIR/std/src/prelude/v1.rs:LL:COL
+  ::: $SRC_DIR/std/src/prelude/mod.rs:LL:COL
    |
-LL | pub use crate::option::Option::{self, None, Some};
-   |                                       ---- the unit variant `None` is defined here
+LL |     pub use super::v1::*;
+   |             ------------ the unit variant `None` is defined here
 
 error[E0530]: match bindings cannot shadow constants
   --> $DIR/issue-27033.rs:7:9
diff --git a/src/test/ui/issues/issue-60662.stdout b/src/test/ui/issues/issue-60662.stdout
index cebe834824a61..14a49f20e6b22 100644
--- a/src/test/ui/issues/issue-60662.stdout
+++ b/src/test/ui/issues/issue-60662.stdout
@@ -3,7 +3,7 @@
 
 #![feature(type_alias_impl_trait)]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 
diff --git a/src/test/ui/proc-macro/meta-macro-hygiene.stdout b/src/test/ui/proc-macro/meta-macro-hygiene.stdout
index a067b7b5411dd..aa51fc8240d63 100644
--- a/src/test/ui/proc-macro/meta-macro-hygiene.stdout
+++ b/src/test/ui/proc-macro/meta-macro-hygiene.stdout
@@ -15,7 +15,7 @@ Respanned: TokenStream [Ident { ident: "$crate", span: $DIR/auxiliary/make-macro
 
 #![no_std /* 0#0 */]
 #[prelude_import /* 0#1 */]
-use core /* 0#1 */::prelude /* 0#1 */::v1 /* 0#1 */::*;
+use core /* 0#1 */::prelude /* 0#1 */::rust_2018 /* 0#1 */::*;
 #[macro_use /* 0#1 */]
 extern crate core /* 0#1 */;
 #[macro_use /* 0#1 */]
diff --git a/src/test/ui/proc-macro/nonterminal-token-hygiene.stdout b/src/test/ui/proc-macro/nonterminal-token-hygiene.stdout
index 1623d67772639..ba3b3ee782784 100644
--- a/src/test/ui/proc-macro/nonterminal-token-hygiene.stdout
+++ b/src/test/ui/proc-macro/nonterminal-token-hygiene.stdout
@@ -35,7 +35,7 @@ PRINT-BANG INPUT (DEBUG): TokenStream [
 
 #![no_std /* 0#0 */]
 #[prelude_import /* 0#1 */]
-use ::core /* 0#1 */::prelude /* 0#1 */::v1 /* 0#1 */::*;
+use ::core /* 0#1 */::prelude /* 0#1 */::rust_2015 /* 0#1 */::*;
 #[macro_use /* 0#1 */]
 extern crate core /* 0#2 */;
 #[macro_use /* 0#1 */]
diff --git a/src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout b/src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout
index c88f50c6813ec..aeee43b01cc02 100644
--- a/src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout
+++ b/src/test/ui/rfc-2497-if-let-chains/ast-pretty-check.stdout
@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // build-pass (FIXME(62277): could be check-pass?)

From d274d87e10af104051e1e71f56539b20350dbdda Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Wed, 17 Feb 2021 15:52:31 +0100
Subject: [PATCH 4/5] Update test/pretty output for edition preludes.

---
 src/test/pretty/asm.pp                           | 2 +-
 src/test/pretty/cast-lt.pp                       | 2 +-
 src/test/pretty/dollar-crate.pp                  | 2 +-
 src/test/pretty/expanded-and-path-remap-80832.pp | 2 +-
 src/test/pretty/issue-12590-c.pp                 | 2 +-
 src/test/pretty/issue-4264.pp                    | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/test/pretty/asm.pp b/src/test/pretty/asm.pp
index b3d188dd70881..c86d8a1197188 100644
--- a/src/test/pretty/asm.pp
+++ b/src/test/pretty/asm.pp
@@ -2,7 +2,7 @@
 #![no_std]
 #![feature(asm)]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 
diff --git a/src/test/pretty/cast-lt.pp b/src/test/pretty/cast-lt.pp
index 47a7dac95b9c5..4f6a924909029 100644
--- a/src/test/pretty/cast-lt.pp
+++ b/src/test/pretty/cast-lt.pp
@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only
diff --git a/src/test/pretty/dollar-crate.pp b/src/test/pretty/dollar-crate.pp
index 131cd0a67c669..f4be3c1c63a84 100644
--- a/src/test/pretty/dollar-crate.pp
+++ b/src/test/pretty/dollar-crate.pp
@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only
diff --git a/src/test/pretty/expanded-and-path-remap-80832.pp b/src/test/pretty/expanded-and-path-remap-80832.pp
index 6dbc19e9d9c6c..1579ea41cfdf1 100644
--- a/src/test/pretty/expanded-and-path-remap-80832.pp
+++ b/src/test/pretty/expanded-and-path-remap-80832.pp
@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // Test for issue 80832
diff --git a/src/test/pretty/issue-12590-c.pp b/src/test/pretty/issue-12590-c.pp
index 1761c0653ce86..dd0b8899b2d9d 100644
--- a/src/test/pretty/issue-12590-c.pp
+++ b/src/test/pretty/issue-12590-c.pp
@@ -1,7 +1,7 @@
 #![feature(prelude_import)]
 #![no_std]
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only
diff --git a/src/test/pretty/issue-4264.pp b/src/test/pretty/issue-4264.pp
index 7b0a00282fbb0..199aee05622be 100644
--- a/src/test/pretty/issue-4264.pp
+++ b/src/test/pretty/issue-4264.pp
@@ -1,5 +1,5 @@
 #[prelude_import]
-use ::std::prelude::v1::*;
+use ::std::prelude::rust_2015::*;
 #[macro_use]
 extern crate std;
 // pretty-compare-only

From 76fd8d7e74a000be4d736c47b55c583d31c907d0 Mon Sep 17 00:00:00 2001
From: Mara <m-ou.se@m-ou.se>
Date: Thu, 25 Feb 2021 12:41:39 +0100
Subject: [PATCH 5/5] Use intra-doc links.

Co-authored-by: Joshua Nelson <joshua@yottadb.com>
---
 library/core/src/prelude/mod.rs | 6 +++---
 library/core/src/prelude/v1.rs  | 2 +-
 library/std/src/prelude/mod.rs  | 6 +++---
 library/std/src/prelude/v1.rs   | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/library/core/src/prelude/mod.rs b/library/core/src/prelude/mod.rs
index 1cb65eabb9a62..8f57db49496c3 100644
--- a/library/core/src/prelude/mod.rs
+++ b/library/core/src/prelude/mod.rs
@@ -10,7 +10,7 @@ pub mod v1;
 
 /// The 2015 version of the core prelude.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2015", issue = "none")]
 pub mod rust_2015 {
     #[unstable(feature = "prelude_2015", issue = "none")]
@@ -20,7 +20,7 @@ pub mod rust_2015 {
 
 /// The 2018 version of the core prelude.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2018", issue = "none")]
 pub mod rust_2018 {
     #[unstable(feature = "prelude_2018", issue = "none")]
@@ -30,7 +30,7 @@ pub mod rust_2018 {
 
 /// The 2021 version of the core prelude.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2021", issue = "none")]
 pub mod rust_2021 {
     #[unstable(feature = "prelude_2021", issue = "none")]
diff --git a/library/core/src/prelude/v1.rs b/library/core/src/prelude/v1.rs
index 993281fe88247..dbbd10cd9930d 100644
--- a/library/core/src/prelude/v1.rs
+++ b/library/core/src/prelude/v1.rs
@@ -1,6 +1,6 @@
 //! The first version of the core prelude.
 //!
-//! See the [module-level documentation](../index.html) for more.
+//! See the [module-level documentation](super) for more.
 
 #![stable(feature = "core_prelude", since = "1.4.0")]
 
diff --git a/library/std/src/prelude/mod.rs b/library/std/src/prelude/mod.rs
index bb45aed90e7f4..505b5f3013b35 100644
--- a/library/std/src/prelude/mod.rs
+++ b/library/std/src/prelude/mod.rs
@@ -87,7 +87,7 @@ pub mod v1;
 
 /// The 2015 version of the prelude of The Rust Standard Library.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2015", issue = "none")]
 pub mod rust_2015 {
     #[unstable(feature = "prelude_2015", issue = "none")]
@@ -97,7 +97,7 @@ pub mod rust_2015 {
 
 /// The 2018 version of the prelude of The Rust Standard Library.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2018", issue = "none")]
 pub mod rust_2018 {
     #[unstable(feature = "prelude_2018", issue = "none")]
@@ -107,7 +107,7 @@ pub mod rust_2018 {
 
 /// The 2021 version of the prelude of The Rust Standard Library.
 ///
-/// See the [module-level documentation](../index.html) for more.
+/// See the [module-level documentation](self) for more.
 #[unstable(feature = "prelude_2021", issue = "none")]
 pub mod rust_2021 {
     #[unstable(feature = "prelude_2021", issue = "none")]
diff --git a/library/std/src/prelude/v1.rs b/library/std/src/prelude/v1.rs
index ef9aec54a4ca2..15afe19f6416c 100644
--- a/library/std/src/prelude/v1.rs
+++ b/library/std/src/prelude/v1.rs
@@ -1,6 +1,6 @@
 //! The first version of the prelude of The Rust Standard Library.
 //!
-//! See the [module-level documentation](../index.html) for more.
+//! See the [module-level documentation](super) for more.
 
 #![stable(feature = "rust1", since = "1.0.0")]