Rollup merge of #65498 - SimonSapin:plugin-help, r=Centril

Plugins deprecation: don’t suggest simply removing the attribute

Building Servo with a recent Nightly produces:

```rust
warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
  --> components/script/lib.rs:14:1
   |
14 | #![plugin(script_plugins)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
   |
   = note: `#[warn(deprecated)]` on by default
```

First, linking to https://github.com/rust-lang/rust/issues/29597 is not ideal since there is pretty much no discussion there of the deprecation and what can be used instead. This PR changes the link to the deprecation PR which does have more discussion.

Second, the “remove this attribute” suggestion is rather unhelpful. Just because a feature is deprecated doesn’t mean that simply removing its use without a replacement is acceptable.

In the case of custom lint, there is no replacement available. Prefixing a message with “help:” when telling users that they’re screwed honestly feels disrespectful.

This PR also changes the message to be more factual.

33 files changed, 84 insertions, 78 deletions

diff --git a/src/libsyntax/feature_gate/builtin_attrs.rs b/src/libsyntax/feature_gate/builtin_attrs.rs
index 043a2ffb5a4..7dd6ae90d9a 100644
--- a/src/libsyntax/feature_gate/builtin_attrs.rs
+++ b/src/libsyntax/feature_gate/builtin_attrs.rs
@@ -286,7 +286,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     (
         sym::plugin_registrar, Normal, template!(Word),
         Gated(
-            Stability::Deprecated("https://github.com/rust-lang/rust/issues/29597", None),
+            Stability::Deprecated(
+                "https://github.com/rust-lang/rust/pull/64675",
+                Some("may be removed in a future compiler version"),
+            ),
             sym::plugin_registrar,
             "compiler plugins are deprecated",
             cfg_fn!(plugin_registrar)
@@ -295,7 +298,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     (
         sym::plugin, CrateLevel, template!(List: "name|name(args)"),
         Gated(
-            Stability::Deprecated("https://github.com/rust-lang/rust/issues/29597", None),
+            Stability::Deprecated(
+                "https://github.com/rust-lang/rust/pull/64675",
+                Some("may be removed in a future compiler version"),
+            ),
             sym::plugin,
             "compiler plugins are deprecated",
             cfg_fn!(plugin)
diff --git a/src/test/ui-fulldeps/gated-plugin.stderr b/src/test/ui-fulldeps/gated-plugin.stderr
index aa031fb7a63..aec1325844f 100644
--- a/src/test/ui-fulldeps/gated-plugin.stderr
+++ b/src/test/ui-fulldeps/gated-plugin.stderr
@@ -7,11 +7,11 @@ LL | #![plugin(attr_plugin_test)]
    = note: for more information, see https://github.com/rust-lang/rust/issues/29597
    = help: add `#![feature(plugin)]` to the crate attributes to enable
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/gated-plugin.rs:3:1
    |
 LL | #![plugin(attr_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/issue-15778-fail.stderr b/src/test/ui-fulldeps/issue-15778-fail.stderr
index 3afdb1fbf80..e76044c56ef 100644
--- a/src/test/ui-fulldeps/issue-15778-fail.stderr
+++ b/src/test/ui-fulldeps/issue-15778-fail.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-15778-fail.rs:6:1
    |
 LL | #![plugin(lint_for_crate)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/issue-15778-pass.stderr b/src/test/ui-fulldeps/issue-15778-pass.stderr
index f81c314c23a..0c30d2cdcbf 100644
--- a/src/test/ui-fulldeps/issue-15778-pass.stderr
+++ b/src/test/ui-fulldeps/issue-15778-pass.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-15778-pass.rs:8:1
    |
 LL | #![plugin(lint_for_crate_rpass)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/issue-40001.stderr b/src/test/ui-fulldeps/issue-40001.stderr
index 186721e2bb9..d0ad0275ed1 100644
--- a/src/test/ui-fulldeps/issue-40001.stderr
+++ b/src/test/ui-fulldeps/issue-40001.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-40001.rs:6:1
    |
 LL | #![plugin(issue_40001_plugin)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-group-plugin-deny-cmdline.stderr b/src/test/ui-fulldeps/lint-group-plugin-deny-cmdline.stderr
index 28065bf3946..f8a4f271da5 100644
--- a/src/test/ui-fulldeps/lint-group-plugin-deny-cmdline.stderr
+++ b/src/test/ui-fulldeps/lint-group-plugin-deny-cmdline.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-group-plugin-deny-cmdline.rs:7:1
    |
 LL | #![plugin(lint_group_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-group-plugin.stderr b/src/test/ui-fulldeps/lint-group-plugin.stderr
index a93cae1a2b1..58dc78b06d3 100644
--- a/src/test/ui-fulldeps/lint-group-plugin.stderr
+++ b/src/test/ui-fulldeps/lint-group-plugin.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-group-plugin.rs:6:1
    |
 LL | #![plugin(lint_group_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin-cmdline-allow.stderr b/src/test/ui-fulldeps/lint-plugin-cmdline-allow.stderr
index 2185929e893..c6d198dc458 100644
--- a/src/test/ui-fulldeps/lint-plugin-cmdline-allow.stderr
+++ b/src/test/ui-fulldeps/lint-plugin-cmdline-allow.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin-cmdline-allow.rs:8:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin-deny-attr.stderr b/src/test/ui-fulldeps/lint-plugin-deny-attr.stderr
index a0cd9687f5b..c611023e549 100644
--- a/src/test/ui-fulldeps/lint-plugin-deny-attr.stderr
+++ b/src/test/ui-fulldeps/lint-plugin-deny-attr.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin-deny-attr.rs:5:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin-deny-cmdline.stderr b/src/test/ui-fulldeps/lint-plugin-deny-cmdline.stderr
index 3c64025e5eb..03668fbfe66 100644
--- a/src/test/ui-fulldeps/lint-plugin-deny-cmdline.stderr
+++ b/src/test/ui-fulldeps/lint-plugin-deny-cmdline.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin-deny-cmdline.rs:6:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin-forbid-attrs.stderr b/src/test/ui-fulldeps/lint-plugin-forbid-attrs.stderr
index c0c43855c92..c0de1feee7d 100644
--- a/src/test/ui-fulldeps/lint-plugin-forbid-attrs.stderr
+++ b/src/test/ui-fulldeps/lint-plugin-forbid-attrs.stderr
@@ -7,11 +7,11 @@ LL | #![forbid(test_lint)]
 LL | #[allow(test_lint)]
    |         ^^^^^^^^^ overruled by previous forbid
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin-forbid-attrs.rs:5:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin-forbid-cmdline.stderr b/src/test/ui-fulldeps/lint-plugin-forbid-cmdline.stderr
index 99d01392191..f189efbf61d 100644
--- a/src/test/ui-fulldeps/lint-plugin-forbid-cmdline.stderr
+++ b/src/test/ui-fulldeps/lint-plugin-forbid-cmdline.stderr
@@ -6,11 +6,11 @@ LL | #[allow(test_lint)]
    |
    = note: `forbid` lint level was set on command line
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin-forbid-cmdline.rs:6:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-plugin.stderr b/src/test/ui-fulldeps/lint-plugin.stderr
index 2ca5eefe437..e95650090dd 100644
--- a/src/test/ui-fulldeps/lint-plugin.stderr
+++ b/src/test/ui-fulldeps/lint-plugin.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-plugin.rs:5:1
    |
 LL | #![plugin(lint_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-tool-cmdline-allow.stderr b/src/test/ui-fulldeps/lint-tool-cmdline-allow.stderr
index 71c3dc929b2..239732521d5 100644
--- a/src/test/ui-fulldeps/lint-tool-cmdline-allow.stderr
+++ b/src/test/ui-fulldeps/lint-tool-cmdline-allow.stderr
@@ -2,11 +2,11 @@ warning: lint name `test_lint` is deprecated and does not have an effect anymore
    |
    = note: requested on the command line with `-A test_lint`
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-tool-cmdline-allow.rs:8:1
    |
 LL | #![plugin(lint_tool_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lint-tool-test.stderr b/src/test/ui-fulldeps/lint-tool-test.stderr
index c727cfc7015..d4031a780c3 100644
--- a/src/test/ui-fulldeps/lint-tool-test.stderr
+++ b/src/test/ui-fulldeps/lint-tool-test.stderr
@@ -32,11 +32,11 @@ warning: lint name `test_lint` is deprecated and may not have an effect in the f
 LL | #![cfg_attr(foo, warn(test_lint))]
    |                       ^^^^^^^^^ help: change it to: `clippy::test_lint`
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lint-tool-test.rs:6:1
    |
 LL | #![plugin(lint_tool_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/llvm-pass-plugin.stderr b/src/test/ui-fulldeps/llvm-pass-plugin.stderr
index ebc092671a7..61b53bb2b7c 100644
--- a/src/test/ui-fulldeps/llvm-pass-plugin.stderr
+++ b/src/test/ui-fulldeps/llvm-pass-plugin.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/llvm-pass-plugin.rs:6:1
    |
 LL | #![plugin(llvm_pass_plugin)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/lto-syntax-extension.stderr b/src/test/ui-fulldeps/lto-syntax-extension.stderr
index 509331ceb21..529da32e10e 100644
--- a/src/test/ui-fulldeps/lto-syntax-extension.stderr
+++ b/src/test/ui-fulldeps/lto-syntax-extension.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/lto-syntax-extension.rs:9:1
    |
 LL | #![plugin(lto_syntax_extension_plugin)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/macro-crate-rlib.stderr b/src/test/ui-fulldeps/macro-crate-rlib.stderr
index 47d5ecb3742..b5bd761f1b5 100644
--- a/src/test/ui-fulldeps/macro-crate-rlib.stderr
+++ b/src/test/ui-fulldeps/macro-crate-rlib.stderr
@@ -4,11 +4,11 @@ error[E0457]: plugin `rlib_crate_test` only found in rlib format, but must be av
 LL | #![plugin(rlib_crate_test)]
    |           ^^^^^^^^^^^^^^^
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/macro-crate-rlib.rs:6:1
    |
 LL | #![plugin(rlib_crate_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/outlive-expansion-phase.stderr b/src/test/ui-fulldeps/outlive-expansion-phase.stderr
index 68e143d86ee..d06fc480fb5 100644
--- a/src/test/ui-fulldeps/outlive-expansion-phase.stderr
+++ b/src/test/ui-fulldeps/outlive-expansion-phase.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/outlive-expansion-phase.rs:6:1
    |
 LL | #![plugin(outlive_expansion_phase)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/plugin-args-1.stderr b/src/test/ui-fulldeps/plugin-args-1.stderr
index 0d01a859df8..ca3e27069ed 100644
--- a/src/test/ui-fulldeps/plugin-args-1.stderr
+++ b/src/test/ui-fulldeps/plugin-args-1.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/plugin-args-1.rs:6:1
    |
 LL | #![plugin(plugin_args)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/plugin-args-2.stderr b/src/test/ui-fulldeps/plugin-args-2.stderr
index 2bbabd20138..57c06513d5c 100644
--- a/src/test/ui-fulldeps/plugin-args-2.stderr
+++ b/src/test/ui-fulldeps/plugin-args-2.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/plugin-args-2.rs:6:1
    |
 LL | #![plugin(plugin_args())]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/plugin-args-3.stderr b/src/test/ui-fulldeps/plugin-args-3.stderr
index bf4108bd7f8..179f1abc8c4 100644
--- a/src/test/ui-fulldeps/plugin-args-3.stderr
+++ b/src/test/ui-fulldeps/plugin-args-3.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/plugin-args-3.rs:6:1
    |
 LL | #![plugin(plugin_args(hello(there), how(are="you")))]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/plugin-attr-register-deny.stderr b/src/test/ui-fulldeps/plugin-attr-register-deny.stderr
index a045782a95f..8d95d6ff2d8 100644
--- a/src/test/ui-fulldeps/plugin-attr-register-deny.stderr
+++ b/src/test/ui-fulldeps/plugin-attr-register-deny.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/plugin-attr-register-deny.rs:5:1
    |
 LL | #![plugin(attr_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/plugin-reexport.stderr b/src/test/ui-fulldeps/plugin-reexport.stderr
index 52d27c32897..365b26d131e 100644
--- a/src/test/ui-fulldeps/plugin-reexport.stderr
+++ b/src/test/ui-fulldeps/plugin-reexport.stderr
@@ -10,11 +10,11 @@ note: consider marking `mac` as `pub` in the imported module
 LL | pub use mac as reexport;
    |         ^^^^^^^^^^^^^^^
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/plugin-reexport.rs:6:1
    |
 LL | #![plugin(attr_plugin_test)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui-fulldeps/roman-numerals-macro.stderr b/src/test/ui-fulldeps/roman-numerals-macro.stderr
index 7ac619185a1..8f3f558e91d 100644
--- a/src/test/ui-fulldeps/roman-numerals-macro.stderr
+++ b/src/test/ui-fulldeps/roman-numerals-macro.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/roman-numerals-macro.rs:6:1
    |
 LL | #![plugin(roman_numerals)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/feature-gate/issue-43106-gating-of-builtin-attrs.stderr b/src/test/ui/feature-gate/issue-43106-gating-of-builtin-attrs.stderr
index 62a6d97dfe8..e78d9840abf 100644
--- a/src/test/ui/feature-gate/issue-43106-gating-of-builtin-attrs.stderr
+++ b/src/test/ui/feature-gate/issue-43106-gating-of-builtin-attrs.stderr
@@ -186,43 +186,43 @@ LL |     mod inner { #![macro_escape] }
    |
    = help: consider an outer attribute, `#[macro_use]` mod ...
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:219:17
    |
 LL |     mod inner { #![plugin_registrar] }
-   |                 ^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |                 ^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:224:5
    |
 LL |     #[plugin_registrar] struct S;
-   |     ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |     ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:227:5
    |
 LL |     #[plugin_registrar] type T = S;
-   |     ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |     ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:230:5
    |
 LL |     #[plugin_registrar] impl S { }
-   |     ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |     ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:216:1
    |
 LL | #[plugin_registrar]
-   | ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:40:1
    |
 LL | #![plugin_registrar]
-   | ^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
 warning: use of deprecated attribute `crate_id`: no longer used.
   --> $DIR/issue-43106-gating-of-builtin-attrs.rs:90:1
diff --git a/src/test/ui/feature-gates/feature-gate-plugin.stderr b/src/test/ui/feature-gates/feature-gate-plugin.stderr
index d1eee8cc588..f89ddf995c4 100644
--- a/src/test/ui/feature-gates/feature-gate-plugin.stderr
+++ b/src/test/ui/feature-gates/feature-gate-plugin.stderr
@@ -7,11 +7,11 @@ LL | #![plugin(foo)]
    = note: for more information, see https://github.com/rust-lang/rust/issues/29597
    = help: add `#![feature(plugin)]` to the crate attributes to enable
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/feature-gate-plugin.rs:3:1
    |
 LL | #![plugin(foo)]
-   | ^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/feature-gates/feature-gate-plugin_registrar.stderr b/src/test/ui/feature-gates/feature-gate-plugin_registrar.stderr
index 1c4ccac1dcf..4856cf7c3f7 100644
--- a/src/test/ui/feature-gates/feature-gate-plugin_registrar.stderr
+++ b/src/test/ui/feature-gates/feature-gate-plugin_registrar.stderr
@@ -16,11 +16,11 @@ LL | #[plugin_registrar]
    = note: for more information, see https://github.com/rust-lang/rust/issues/29597
    = help: add `#![feature(plugin_registrar)]` to the crate attributes to enable
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/feature-gate-plugin_registrar.rs:5:1
    |
 LL | #[plugin_registrar]
-   | ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/invalid/invalid-plugin-attr.stderr b/src/test/ui/invalid/invalid-plugin-attr.stderr
index d14a7524bf2..0d7315dd887 100644
--- a/src/test/ui/invalid/invalid-plugin-attr.stderr
+++ b/src/test/ui/invalid/invalid-plugin-attr.stderr
@@ -1,8 +1,8 @@
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/invalid-plugin-attr.rs:4:1
    |
 LL | #[plugin(bla)]
-   | ^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/malformed/malformed-plugin-1.stderr b/src/test/ui/malformed/malformed-plugin-1.stderr
index d8416c40954..3860864bd13 100644
--- a/src/test/ui/malformed/malformed-plugin-1.stderr
+++ b/src/test/ui/malformed/malformed-plugin-1.stderr
@@ -4,11 +4,11 @@ error: malformed `plugin` attribute input
 LL | #![plugin]
    | ^^^^^^^^^^ help: must be of the form: `#[plugin(name|name(args))]`
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/malformed-plugin-1.rs:2:1
    |
 LL | #![plugin]
-   | ^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/malformed/malformed-plugin-2.stderr b/src/test/ui/malformed/malformed-plugin-2.stderr
index 34383ba0828..e4bca93f13b 100644
--- a/src/test/ui/malformed/malformed-plugin-2.stderr
+++ b/src/test/ui/malformed/malformed-plugin-2.stderr
@@ -4,11 +4,11 @@ error: malformed `plugin` attribute input
 LL | #![plugin="bleh"]
    | ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[plugin(name|name(args))]`
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/malformed-plugin-2.rs:2:1
    |
 LL | #![plugin="bleh"]
-   | ^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/malformed/malformed-plugin-3.stderr b/src/test/ui/malformed/malformed-plugin-3.stderr
index 71f607d68a4..7393072cb1c 100644
--- a/src/test/ui/malformed/malformed-plugin-3.stderr
+++ b/src/test/ui/malformed/malformed-plugin-3.stderr
@@ -4,11 +4,11 @@ error[E0498]: malformed `plugin` attribute
 LL | #![plugin(foo="bleh")]
    | ^^^^^^^^^^^^^^^^^^^^^^ malformed attribute
 
-warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/malformed-plugin-3.rs:2:1
    |
 LL | #![plugin(foo="bleh")]
-   | ^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
diff --git a/src/test/ui/multiple-plugin-registrars.stderr b/src/test/ui/multiple-plugin-registrars.stderr
index 3a7895a08c6..dad8172e0c5 100644
--- a/src/test/ui/multiple-plugin-registrars.stderr
+++ b/src/test/ui/multiple-plugin-registrars.stderr
@@ -1,16 +1,16 @@
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/multiple-plugin-registrars.rs:6:1
    |
 LL | #[plugin_registrar]
-   | ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
    |
    = note: `#[warn(deprecated)]` on by default
 
-warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+warning: use of deprecated attribute `plugin_registrar`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/pull/64675
   --> $DIR/multiple-plugin-registrars.rs:9:1
    |
 LL | #[plugin_registrar]
-   | ^^^^^^^^^^^^^^^^^^^ help: remove this attribute
+   | ^^^^^^^^^^^^^^^^^^^ help: may be removed in a future compiler version
 
 error: multiple plugin registration functions found
    |