Add comment, which was removed by accident (again)

TimDiekmann · TimDiekmann · commit 66a651244ee8 · 2020-08-18T10:00:31.000+02:00
diff --git a/library/std/src/alloc.rs b/library/std/src/alloc.rs
@@ -187,6 +187,8 @@ impl System {
     }
 }
 
+// The AllocRef impl checks the layout size to be non-zero and forwards to the GlobalAlloc impl,
+// which is in `std::sys::*::alloc`.
 #[unstable(feature = "allocator_api", issue = "32838")]
 unsafe impl AllocRef for System {
     #[inline]

Original file line number	Diff line number	Diff line change
`@@ -187,6 +187,8 @@ impl System {`
`187`	`187`	`}`
`188`	`188`	`}`
`189`	`189`
	`190`	`+// The AllocRef impl checks the layout size to be non-zero and forwards to the GlobalAlloc impl,`
	`191`	+// which is in `std::sys::*::alloc`.
`190`	`192`	`#[unstable(feature = "allocator_api", issue = "32838")]`
`191`	`193`	`unsafe impl AllocRef for System {`
`192`	`194`	`#[inline]`