Auto merge of #87569 - JohnTitor:rollup-7ydfetw, r=JohnTitor

Rollup of 10 pull requests

Successful merges:

 - #81050 (Stabilize core::task::ready!)
 - #81363 (Remove P: Unpin bound on impl Future for Pin)
 - #86839 (Add doc aliases to fs.rs)
 - #87435 (fix example code for E0617)
 - #87451 (Add support for tuple struct field documentation)
 - #87491 (Integrate context into the memorial to Anna)
 - #87521 (Add long explanation for E0498)
 - #87527 (Don't run MIR unsafeck at all when using `-Zthir-unsafeck`)
 - #87550 (Add `CI_ONLY_WHEN_CHANNEL` and run `x86_64-gnu-stable` only on nightly)
 - #87565 (Use backticks when referring to `core::future::Ready` in panic message)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

3 files changed, 30 insertions, 5 deletions

diff --git a/compiler/rustc_error_codes/src/error_codes.rs b/compiler/rustc_error_codes/src/error_codes.rs
index 6f65d386f0d..65999ba707c 100644
--- a/compiler/rustc_error_codes/src/error_codes.rs
+++ b/compiler/rustc_error_codes/src/error_codes.rs
@@ -248,6 +248,7 @@ E0493: include_str!("./error_codes/E0493.md"),
 E0495: include_str!("./error_codes/E0495.md"),
 E0496: include_str!("./error_codes/E0496.md"),
 E0497: include_str!("./error_codes/E0497.md"),
+E0498: include_str!("./error_codes/E0498.md"),
 E0499: include_str!("./error_codes/E0499.md"),
 E0500: include_str!("./error_codes/E0500.md"),
 E0501: include_str!("./error_codes/E0501.md"),
@@ -604,7 +605,6 @@ E0783: include_str!("./error_codes/E0783.md"),
 //  E0488, // lifetime of variable does not enclose its declaration
 //  E0489, // type/lifetime parameter not in scope here
     E0490, // a value of type `..` is borrowed for too long
-    E0498,  // malformed plugin attribute
     E0514, // metadata version mismatch
     E0519, // local crate and dependency have same (crate-name, disambiguator)
     // two dependencies have same (crate-name, disambiguator) but different SVH
diff --git a/compiler/rustc_error_codes/src/error_codes/E0498.md b/compiler/rustc_error_codes/src/error_codes/E0498.md
new file mode 100644
index 00000000000..c9ea4a7947f
--- /dev/null
+++ b/compiler/rustc_error_codes/src/error_codes/E0498.md
@@ -0,0 +1,22 @@
+The `plugin` attribute was malformed.
+
+Erroneous code example:
+
+```compile_fail,E0498
+#![feature(plugin)]
+#![plugin(foo(args))] // error: invalid argument
+#![plugin(bar="test")] // error: invalid argument
+```
+
+The `#[plugin]` attribute should take a single argument: the name of the plugin.
+
+For example, for the plugin `foo`:
+
+```ignore (requires external plugin crate)
+#![feature(plugin)]
+#![plugin(foo)] // ok!
+```
+
+See the [`plugin` feature] section of the Unstable book for more details.
+
+[`plugin` feature]: https://doc.rust-lang.org/nightly/unstable-book/language-features/plugin.html
diff --git a/compiler/rustc_error_codes/src/error_codes/E0617.md b/compiler/rustc_error_codes/src/error_codes/E0617.md
index 1c5d1f87b91..eed384b4959 100644
--- a/compiler/rustc_error_codes/src/error_codes/E0617.md
+++ b/compiler/rustc_error_codes/src/error_codes/E0617.md
@@ -3,12 +3,13 @@ Attempted to pass an invalid type of variable into a variadic function.
 Erroneous code example:
 
 ```compile_fail,E0617
+# use std::os::raw::{c_char, c_int};
 extern "C" {
-    fn printf(c: *const i8, ...);
+    fn printf(format: *const c_char, ...) -> c_int;
 }
 
 unsafe {
-    printf(::std::ptr::null(), 0f32);
+    printf("%f\n\0".as_ptr() as _, 0f32);
     // error: cannot pass an `f32` to variadic function, cast to `c_double`
 }
 ```
@@ -21,10 +22,12 @@ to import from `std::os::raw`).
 In this case, `c_double` has the same size as `f64` so we can use it directly:
 
 ```no_run
+# use std::os::raw::{c_char, c_int};
 # extern "C" {
-#     fn printf(c: *const i8, ...);
+#     fn printf(format: *const c_char, ...) -> c_int;
 # }
+
 unsafe {
-    printf(::std::ptr::null(), 0f64); // ok!
+    printf("%f\n\0".as_ptr() as _, 0f64); // ok!
 }
 ```