auto merge of #9459 : eliovir/rust/patch-1, r=bstrie

bors · bors · commit 058a5d97a278 · 2013-09-28T05:26:04.000-07:00
change formula (other solution could be using abs()).
diff --git a/doc/tutorial.md b/doc/tutorial.md
@@ -737,7 +737,7 @@ fn area(sh: Shape) -> float {
     match sh {
         Circle { radius: radius, _ } => float::consts::pi * square(radius),
         Rectangle { top_left: top_left, bottom_right: bottom_right } => {
-            (bottom_right.x - top_left.x) * (bottom_right.y - top_left.y)
+            (bottom_right.x - top_left.x) * (top_left.y - bottom_right.y) 
         }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -737,7 +737,7 @@ fn area(sh: Shape) -> float {`
`737`	`737`	`match sh {`
`738`	`738`	`Circle { radius: radius, _ } => float::consts::pi * square(radius),`
`739`	`739`	`Rectangle { top_left: top_left, bottom_right: bottom_right } => {`
`740`		`- (bottom_right.x - top_left.x) * (bottom_right.y - top_left.y)`
	`740`	`+ (bottom_right.x - top_left.x) * (top_left.y - bottom_right.y)`
`741`	`741`	`}`
`742`	`742`	`}`
`743`	`743`	`}`