From 156734dda02737d6462e72163d7a62acd05a6802 Mon Sep 17 00:00:00 2001
From: Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>
Date: Fri, 18 Mar 2022 18:14:34 +0100
Subject: [PATCH] Document that `Option<extern "abi" fn>` discriminant elision
 applies for any ABI

The current phrasing was not very clear on that aspect.
---
 library/core/src/option.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/library/core/src/option.rs b/library/core/src/option.rs
index de1628f83ad..bcba18a4a3e 100644
--- a/library/core/src/option.rs
+++ b/library/core/src/option.rs
@@ -80,11 +80,13 @@
 //! * [`Box<U>`]
 //! * `&U`
 //! * `&mut U`
-//! * `fn`, `extern "C" fn`
+//! * `fn`, `extern "C" fn`[^extern_fn]
 //! * [`num::NonZero*`]
 //! * [`ptr::NonNull<U>`]
 //! * `#[repr(transparent)]` struct around one of the types in this list.
 //!
+//! [^extern_fn]: this remains true for any other ABI: `extern "abi" fn` (_e.g._, `extern "system" fn`)
+//!
 //! [`Box<U>`]: ../../std/boxed/struct.Box.html
 //! [`num::NonZero*`]: crate::num
 //! [`ptr::NonNull<U>`]: crate::ptr::NonNull