plugin_registrary: use normal deprecation instead of hard coded warning.

Author: Centril

src/libsyntax/feature_gate/builtin_attrs.rs

@@ -278,13 +278,21 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     ),
 
     // Plugins:
-    ungated!(plugin_registrar, Normal, template!(Word)),
+    (
+        sym::plugin_registrar, Normal, template!(Word),
+        Gated(
+            Stability::Deprecated("https://github.com/rust-lang/rust/issues/29597", None),
+            sym::plugin_registrar,
+            "compiler plugins are deprecated",
+            cfg_fn!(plugin_registrar)
+        )
+    ),
     (
         sym::plugin, CrateLevel, template!(List: "name|name(args)"),
         Gated(
             Stability::Deprecated("https://github.com/rust-lang/rust/issues/29597", None),
             sym::plugin,
-            "compiler plugins are deprecated and will be removed in 1.44.0",
+            "compiler plugins are deprecated",
             cfg_fn!(plugin)
         )
     ),

src/libsyntax/feature_gate/check.rs

@@ -311,10 +311,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                 if attr::contains_name(&i.attrs[..], sym::plugin_registrar) {
                     gate_feature_post!(&self, plugin_registrar, i.span,
                                        "compiler plugins are experimental and possibly buggy");
-                    self.parse_sess.span_diagnostic.span_warn(
-                        i.span,
-                        "`#[plugin_registrar]` is deprecated and will be removed in 1.44.0",
-                    );
                 }
                 if attr::contains_name(&i.attrs[..], sym::start) {
                     gate_feature_post!(&self, start, i.span,

src/test/ui-fulldeps/gated-plugin.rs

@@ -1,8 +1,7 @@
-// ignore-tidy-linelength
 // aux-build:attr-plugin-test.rs
 
 #![plugin(attr_plugin_test)]
-//~^ ERROR compiler plugins are deprecated and will be removed in 1.44.0
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated and will be removed in 1.44.0
+//~^ ERROR compiler plugins are deprecated
+//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
 
 fn main() {}

src/test/ui-fulldeps/gated-plugin.stderr

@@ -1,14 +1,14 @@
-error[E0658]: compiler plugins are deprecated and will be removed in 1.44.0
-  --> $DIR/gated-plugin.rs:4:1
+error[E0658]: compiler plugins are deprecated
+  --> $DIR/gated-plugin.rs:3:1
    |
 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 and will be removed in 1.44.0. See https://github.com/rust-lang/rust/issues/29597
-  --> $DIR/gated-plugin.rs:4:1
+warning: use of deprecated attribute `plugin`: compiler plugins are deprecated. See https://github.com/rust-lang/rust/issues/29597
+  --> $DIR/gated-plugin.rs:3:1
    |
 LL | #![plugin(attr_plugin_test)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute

src/test/ui-fulldeps/macro-crate-rlib.rs

@@ -5,6 +5,6 @@
 #![feature(plugin)]
 #![plugin(rlib_crate_test)]
 //~^ ERROR: plugin `rlib_crate_test` only found in rlib format, but must be available in dylib format
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated and will be removed in 1.44.0
+//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
 
 fn main() {}

src/test/ui-fulldeps/macro-crate-rlib.stderr

@@ -4,7 +4,7 @@ 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 and will be removed in 1.44.0. 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/issues/29597
   --> $DIR/macro-crate-rlib.rs:6:1
    |
 LL | #![plugin(rlib_crate_test)]

src/test/ui/feature-gate/issue-43106-gating-of-builtin-attrs.rs

@@ -32,9 +32,13 @@
 
 // check-pass
 
-#![feature(test)]
+#![feature(test, plugin_registrar)]
 #![warn(unused_attributes, unknown_lints)]
 
+// Exception, a gated and deprecated attribute.
+
+#![plugin_registrar] //~ WARN unused attribute
+
 // UNGATED WHITE-LISTED BUILT-IN ATTRIBUTES
 
 #![warn(x5400)] //~ WARN unknown lint: `x5400`
@@ -43,7 +47,6 @@
 #![deny(x5100)] //~ WARN unknown lint: `x5100`
 #![macro_use] // (allowed if no argument; see issue-43160-gating-of-macro_use.rs)
 #![macro_export] //~ WARN unused attribute
-#![plugin_registrar] //~ WARN unused attribute
 // skipping testing of cfg
 // skipping testing of cfg_attr
 #![main] //~ WARN unused attribute