Auto merge of #116412 - nnethercote:rm-plugin-support, r=bjorn3

Remove support for compiler plugins.

They've been deprecated for four years.

This commit includes the following changes.
- It eliminates the `rustc_plugin_impl` crate.
- It changes the language used for lints in `compiler/rustc_driver_impl/src/lib.rs` and `compiler/rustc_lint/src/context.rs`. External lints are now called "loaded" lints, rather than "plugins" to avoid confusion with the old plugins. This only has a tiny effect on the output of `-W help`.
- E0457 and E0498 are no longer used.
- E0463 is narrowed, now only relating to unfound crates, not plugins.
- The `plugin` feature was moved from "active" to "removed".
- It removes the entire plugins chapter from the unstable book.
- It removes quite a few tests, mostly all of those in `tests/ui-fulldeps/plugin/`.

Closes #29597.

r? `@ghost`

10 files changed, 0 insertions, 109 deletions

diff --git a/tests/ui/error-codes/E0463.rs b/tests/ui/error-codes/E0463.rs
deleted file mode 100644
index 683565281cf..00000000000
--- a/tests/ui/error-codes/E0463.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-#![feature(plugin)]
-#![plugin(cookie_monster)]
-//~^ ERROR E0463
-extern crate cake_is_a_lie;
-
-fn main() {
-}
diff --git a/tests/ui/error-codes/E0463.stderr b/tests/ui/error-codes/E0463.stderr
deleted file mode 100644
index 1aa66e1ec88..00000000000
--- a/tests/ui/error-codes/E0463.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0463]: can't find crate for `cookie_monster`
-  --> $DIR/E0463.rs:2:11
-   |
-LL | #![plugin(cookie_monster)]
-   |           ^^^^^^^^^^^^^^ can't find crate
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0463`.
diff --git a/tests/ui/invalid/invalid-plugin-attr.rs b/tests/ui/invalid/invalid-plugin-attr.rs
deleted file mode 100644
index 3080af24500..00000000000
--- a/tests/ui/invalid/invalid-plugin-attr.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-#![deny(unused_attributes)]
-#![feature(plugin)]
-
-#[plugin(bla)] //~ ERROR should be an inner attribute
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
-
-fn main() {}
diff --git a/tests/ui/invalid/invalid-plugin-attr.stderr b/tests/ui/invalid/invalid-plugin-attr.stderr
deleted file mode 100644
index d3882d33fc4..00000000000
--- a/tests/ui/invalid/invalid-plugin-attr.stderr
+++ /dev/null
@@ -1,22 +0,0 @@
-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: may be removed in a future compiler version
-   |
-   = note: `#[warn(deprecated)]` on by default
-
-error: crate-level attribute should be an inner attribute: add an exclamation mark: `#![foo]`
-  --> $DIR/invalid-plugin-attr.rs:4:1
-   |
-LL | #[plugin(bla)]
-   | ^^^^^^^^^^^^^^
-   |
-note: the lint level is defined here
-  --> $DIR/invalid-plugin-attr.rs:1:9
-   |
-LL | #![deny(unused_attributes)]
-   |         ^^^^^^^^^^^^^^^^^
-
-error: aborting due to previous error; 1 warning emitted
-
diff --git a/tests/ui/malformed/malformed-plugin-1.rs b/tests/ui/malformed/malformed-plugin-1.rs
deleted file mode 100644
index d4c1a2a1679..00000000000
--- a/tests/ui/malformed/malformed-plugin-1.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-#![feature(plugin)]
-#![plugin] //~ ERROR malformed `plugin` attribute
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
-
-fn main() {}
diff --git a/tests/ui/malformed/malformed-plugin-1.stderr b/tests/ui/malformed/malformed-plugin-1.stderr
deleted file mode 100644
index 505f6b6f140..00000000000
--- a/tests/ui/malformed/malformed-plugin-1.stderr
+++ /dev/null
@@ -1,16 +0,0 @@
-error: malformed `plugin` attribute input
-  --> $DIR/malformed-plugin-1.rs:2:1
-   |
-LL | #![plugin]
-   | ^^^^^^^^^^ help: must be of the form: `#![plugin(name)]`
-
-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: may be removed in a future compiler version
-   |
-   = note: `#[warn(deprecated)]` on by default
-
-error: aborting due to previous error; 1 warning emitted
-
diff --git a/tests/ui/malformed/malformed-plugin-2.rs b/tests/ui/malformed/malformed-plugin-2.rs
deleted file mode 100644
index ba80d97a3c2..00000000000
--- a/tests/ui/malformed/malformed-plugin-2.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-#![feature(plugin)]
-#![plugin="bleh"] //~ ERROR malformed `plugin` attribute
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
-
-fn main() {}
diff --git a/tests/ui/malformed/malformed-plugin-2.stderr b/tests/ui/malformed/malformed-plugin-2.stderr
deleted file mode 100644
index 52bbd82a389..00000000000
--- a/tests/ui/malformed/malformed-plugin-2.stderr
+++ /dev/null
@@ -1,16 +0,0 @@
-error: malformed `plugin` attribute input
-  --> $DIR/malformed-plugin-2.rs:2:1
-   |
-LL | #![plugin="bleh"]
-   | ^^^^^^^^^^^^^^^^^ help: must be of the form: `#![plugin(name)]`
-
-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: may be removed in a future compiler version
-   |
-   = note: `#[warn(deprecated)]` on by default
-
-error: aborting due to previous error; 1 warning emitted
-
diff --git a/tests/ui/malformed/malformed-plugin-3.rs b/tests/ui/malformed/malformed-plugin-3.rs
deleted file mode 100644
index d2bd8f9f8dc..00000000000
--- a/tests/ui/malformed/malformed-plugin-3.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-#![feature(plugin)]
-#![plugin(foo="bleh")] //~ ERROR malformed `plugin` attribute
-//~| WARN use of deprecated attribute `plugin`: compiler plugins are deprecated
-
-fn main() {}
diff --git a/tests/ui/malformed/malformed-plugin-3.stderr b/tests/ui/malformed/malformed-plugin-3.stderr
deleted file mode 100644
index 64cb429ea74..00000000000
--- a/tests/ui/malformed/malformed-plugin-3.stderr
+++ /dev/null
@@ -1,17 +0,0 @@
-error[E0498]: malformed `plugin` attribute
-  --> $DIR/malformed-plugin-3.rs:2:11
-   |
-LL | #![plugin(foo="bleh")]
-   |           ^^^^^^^^^^ malformed attribute
-
-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: may be removed in a future compiler version
-   |
-   = note: `#[warn(deprecated)]` on by default
-
-error: aborting due to previous error; 1 warning emitted
-
-For more information about this error, try `rustc --explain E0498`.