From 492826ac144666c75d68bc0a0121453ecc08561f Mon Sep 17 00:00:00 2001
From: Alexis Bourget <alexis.bourget@gmail.com>
Date: Sat, 5 Sep 2020 22:37:36 +0200
Subject: [PATCH] Add a note about the panic behavior of math operations on
 time objects

---
 library/std/src/time.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 73c0a7b403a..42f1cde3e1c 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -100,6 +100,11 @@
 /// [clock_time_get (Monotonic Clock)]: https://nuxi.nl/cloudabi/#clock_time_get
 ///
 /// **Disclaimer:** These system calls might change over time.
+///
+/// > Note: mathematical operations like [`add`] may panic if the underlying
+/// > structure cannot represent the new point in time.
+///
+/// [`add`]: Instant::add
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[stable(feature = "time2", since = "1.8.0")]
 pub struct Instant(time::Instant);
@@ -174,6 +179,11 @@
 /// [GetSystemTimeAsFileTime]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemtimeasfiletime
 ///
 /// **Disclaimer:** These system calls might change over time.
+///
+/// > Note: mathematical operations like [`add`] may panic if the underlying
+/// > structure cannot represent the new point in time.
+///
+/// [`add`]: SystemTime::add
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[stable(feature = "time2", since = "1.8.0")]
 pub struct SystemTime(time::SystemTime);