Fix the <RangeFrom<A> as Iterator>::count

nagisa · nagisa · commit 667734e051d2 · 2017-06-09T15:25:59.000+03:00
diff --git a/src/libcore/iter/range.rs b/src/libcore/iter/range.rs
@@ -329,9 +329,9 @@ impl<A: Step> Iterator for ops::RangeFrom<A> where
         (usize::MAX, None)
     }
 
-    #[inline]
+    #[cold]
     fn count(self) -> usize {
-        usize::MAX
+        panic!("Iterator::count on a `x..` will overflow")
     }
 
     #[inline]

Original file line number	Diff line number	Diff line change
`@@ -329,9 +329,9 @@ impl<A: Step> Iterator for ops::RangeFrom<A> where`
`329`	`329`	`(usize::MAX, None)`
`330`	`330`	`}`
`331`	`331`
`332`		`- #[inline]`
	`332`	`+ #[cold]`
`333`	`333`	`fn count(self) -> usize {`
`334`		`- usize::MAX`
	`334`	+ panic!("Iterator::count on a `x..` will overflow")
`335`	`335`	`}`
`336`	`336`
`337`	`337`	`#[inline]`